Руководство mime pdf



при работе с PDF-файлами я столкнулся с типами MIME application/pdf и application/x-pdf среди других.

есть ли разница между этими двумя типами, и если да, что это? Один предпочтительнее другого?

Я работаю над веб-приложением, которое должно доставлять огромное количество PDF-файлов, и я хочу сделать это правильно, если он есть.


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3 ответов:

стандартный тип MIME application/pdf. Назначение определяется в RFC 3778, приложение / pdf тип носителя, на которые ссылается MIME Media Types registry.

типы MIME контролируются органом стандартов, Интернет Назначил Номера Власти (IANA). Это та же организация, которая управляет корневыми серверами имен и пространством IP-адресов.

использование x-pdf предшествует стандартизации MIME тип для PDF. Типы MIME в x- пространства имен считаются экспериментальными, так же как и в vnd. пространства имен считаются зависящими от поставщика. x-pdf может использоваться для совместимости со старым программным обеспечением.

Это соглашение, определенное в RFC 2045-многофункциональные расширения интернет-почты (MIME) Часть первая: формат тел интернет-сообщений.

  1. частная [подтип] значения (начиная с «X-«) могут быть определены
    на двусторонней основе между двух взаимодействующих агентов без
    вне регистрации или стандартизации. Эти ценности
    не может быть зарегистрирован или стандартизирован.

  2. новые стандартные значения должны быть зарегистрирован в IANA, как описано в RFC 2048.

аналогичное ограничение применяется к типу верхнего уровня. Из того же источника,

Если по какой-либо причине должен использоваться другой тип верхнего уровня, он должен быть
дали имя, начинающееся с «X -«, чтобы указать его нестандартный статус
и чтобы избежать потенциального конфликта с будущим официальным названием.

(обратите внимание, что в RFC 2045, » [m]atching СМИ тип и подтип всегда нечувствительны к регистру», поэтому нет никакой разницы между интерпретацией «X -» и » x -«.)

поэтому справедливо предположить, что» application/x-foo «использовался до того, как IANA определила»application/foo». И он все еще может использоваться людьми, которые не знают о назначении токена IANA.

Как сказал Крис Хэнсон, типы MIME контролируются IANA. Это подробно описано в RFC 2048-многофункциональные расширения интернет-почты (MIME) Часть четвертая: Процедуры Регистрации. Согласно RFC 3778, которая составляет цитируется IANA как определение для «application / pdf»,

тип носителя application / pdf был впервые зарегистрирован в 1993 году Полом Линднером для использования протоколом gopher; регистрация была впоследствии обновлена в 1994 году Стивом Зиллсом.

тип «приложение / pdf» существует уже более десяти лет. Так что мне кажется, что где бы то ни было «application / x-pdf» был использован в новых приложениях, решение, возможно, не было преднамеренным.

из Википедии тип СМИ,

тип носителя состоит из типа, подтипа и необязательно
параметры. Например, HTML-файл может быть обозначен как text / html; charset=UTF-8.

тип носителя состоит из имени типа верхнего уровня и имени подтипа, которое является
далее структурируются в так называемые»деревья».

top-level type name / subtype name [ ; parameters ]

top-level type name / [ tree. ] subtype name [ +suffix ] [ ; parameters ]

все типы носителей должны быть зарегистрированы с использованием процедур регистрации IANA. В настоящее время следующее создаются деревья:standard,vendor,personal или vanity незарегистрированный x.

стандартные:

типы носителей в дереве стандартов не используют фасет дерева (префикс).

type / media type name [+suffix]

примеры: «application / xhtml+xml»,»image/png»

продавец:

дерево поставщиков используется для типов носителей, связанных с общедоступными
товары. Он использует vnd. грань.

type / vnd. media type name [+suffix] - used in the case of well-known producer

type / vnd. producer's name followed by media type name [+suffix] - producer's name must be approved by IANA

type / vnd. producer's name followed by product's name [+suffix] - producer's name must be approved by IANA

личное или тщеславие дерево:

личные или тщеславие дерево включает в себя типы носителей, созданных экспериментально или
в составе продукции, которая не распространяется в коммерческих целях. Он использует
prs. аспект.

type / prs. media type name [+suffix]

незарегистрированное x. tree:

дерево «x.» может использоваться для типов носителей, предназначенных исключительно для использования
в частных, локальных средах и только при активном согласии
стороны обмениваются ими. Типы в этом дереве не могут быть зарегистрированы.

согласно предыдущей версии RFC 6838-устаревший RFC 2048
(опубликовано в ноябре 1996 года) это должно быть редко, если когда-либо, необходимо
использовать незарегистрированные экспериментальные типы, и как таковое использование обоих «x-»
и» Х » формы обескураживает
. Предыдущие версии этого RFC — RFC
1590 и RFC 1521 заявили, что использование обозначения» x — » для
имя подтипа может использоваться для незарегистрированных и частных подтипов, но
эта рекомендация была отменена в ноябре 1996 года.

type / x. media type name [+suffix]

так что ясно, что стандартный тип MIME type application/pdf является подходящим для использования в то время как вы должны избегать использования устаревших и незарегистрированных x- тип носителя, как указано в RFC 2048 и RFC 6838.

PDF is an abbreviation for Portable Document Format, which was introduced by Adobe in 1993 and has since become a reliable way to present and exchange documents. Adobe Systems created it for easy document exchange. It is Commonly used with Adobe and Acrobat Reader.

The International Organization for Standardization now maintains the PDF format as an open standard (ISO standard)(ISO 32000-1:2008). The good thing about PDF Documents is these documents do not rely on any software or hardware. It is used throughout the web, email, and anywhere else where a document exchange mechanism is used.

These documents may include images, text, graphics, video, audio, buttons, form fields, links, and so on.

When a PDF file is not displaying or functioning properly, the easiest solution would be to repair PDF documents with the help of dedicated software. The tool can detect and fix most regular errors and avoid losing any important data from the PDF document.

There are various Internet MIME Types for PDF found like 

  • application/pdf
  • application/x-pdf
  • application/x-bzpdf
  • application/x-gzpdf
  • applications/vnd.pdf
  • application/acrobat
  • application/x-google-chrome-pdf
  • text/pdf
  • text/x-pdf

Among them, the standard one is:

application/pdf

The assignment for this mime-type is defined in RFC 8118, The application/pdf Media Type, which can be found in the Media Types registry.

Here,

  • Type name: application
  • Subtype name: pdf
  • Required parameters: none
  • Optional parameter: none
  • Encoding considerations: binary

Also, If you have to use content-type for pdf then always use application/pdf  as  content-type:application/pdf

FAQ:

How to convert MIME to PDF?

We can easily convert the file extension .mime to PDF with the help of a PDF printer. This software is free of charge, has no restrictions, works in offline versions, and many more.

How to accept and download pdf files in asp.net?

Small snippets are attached here.

Response.ContentType = "application/pdf";  
Response.AppendHeader("Content-Disposition", "attachment; filename=my_pdf_file.pdf");
Response.TransmitFile(Server.MapPath("~/wwwroot/my_pdf_file.pdf"));
Response.End(); 

What are PDF/X, PDF/A, and PDF/E?

These are 3 standard PDF files.

  • PDF/X: Ensures that the file will print properly when sent to professional printing (no RGB colors, all fonts embedded, etc.).
  • PDF/A: Ensures that the file is suitable for archiving, that is, that it will remain readable for a long time despite technological changes.
  • PDF/E: This format is especially useful for engineering documents.

What is xpdf ?

Xpdf is a free and open-source PDF viewer that runs on operating systems that support the Qt toolkit. There is no connection between pdf and xpdf.

From Wikipedia Media type,

A media type is composed of a type, a subtype, and optional
parameters. As an example, an HTML file might be designated text/html; charset=UTF-8.

Media type consists of top-level type name and sub-type name, which is
further structured into so-called «trees».

top-level type name / subtype name [ ; parameters ]

top-level type name / [ tree. ] subtype name [ +suffix ] [ ; parameters ]

All media types should be registered using the IANA registration procedures. Currently the following trees are created: standard, vendor, personal or vanity, unregistered x.

Standard:

Media types in the standards tree do not use any tree facet (prefix).

type / media type name [+suffix]

Examples: «application/xhtml+xml», «image/png»

Vendor:

Vendor tree is used for media types associated with publicly available
products. It uses vnd. facet.

type / vnd. media type name [+suffix] - used in the case of well-known producer

type / vnd. producer's name followed by media type name [+suffix] - producer's name must be approved by IANA

type / vnd. producer's name followed by product's name [+suffix] - producer's name must be approved by IANA

Personal or Vanity tree:

Personal or Vanity tree includes media types created experimentally or
as part of products that are not distributed commercially. It uses
prs. facet.

type / prs. media type name [+suffix]

Unregistered x. tree:

The «x.» tree may be used for media types intended exclusively for use
in private, local environments and only with the active agreement of
the parties exchanging them. Types in this tree cannot be registered.

According to the previous version of RFC 6838 — obsoleted RFC 2048
(published in November 1996) it should rarely, if ever, be necessary
to use unregistered experimental types, and as such use of both «x-»
and «x.» forms is discouraged
. Previous versions of that RFC — RFC
1590 and RFC 1521 stated that the use of «x-» notation for the
sub-type name may be used for unregistered and private sub-types, but
this recommendation was obsoleted in November 1996.

type / x. media type name [+suffix]

So its clear that the standard type MIME type application/pdf is the appropriate one to use while you should avoid using the obsolete and unregistered x- media type as stated in RFC 2048 and RFC 6838.

application/andrew-inset
N/A
Andrew Toolkit

application/applixware
.aw
Applixware

application/atom+xml
.atom, .xml
Atom Syndication Format

application/atomcat+xml
.atomcat
Atom Publishing Protocol

application/atomsvc+xml
.atomsvc
Atom Publishing Protocol Service Document

application/ccxml+xml,
.ccxml
Voice Browser Call Control

application/cdmi-capability
.cdmia
Cloud Data Management Interface (CDMI) — Capability

application/cdmi-container
.cdmic
Cloud Data Management Interface (CDMI) — Contaimer

application/cdmi-domain
.cdmid
Cloud Data Management Interface (CDMI) — Domain

application/cdmi-object
.cdmio
Cloud Data Management Interface (CDMI) — Object

application/cdmi-queue
.cdmiq
Cloud Data Management Interface (CDMI) — Queue

application/cu-seeme
.cu
CU-SeeMe

application/davmount+xml
.davmount
Web Distributed Authoring and Versioning

application/dssc+der
.dssc
Data Structure for the Security Suitability of Cryptographic Algorithms

application/dssc+xml
.xdssc
Data Structure for the Security Suitability of Cryptographic Algorithms

application/ecmascript
.es
ECMAScript

application/emma+xml
.emma
Extensible MultiModal Annotation

application/epub+zip
.epub
Electronic Publication

application/exi
.exi
Efficient XML Interchange

application/font-tdpfr
.pfr
Portable Font Resource

application/hyperstudio
.stk
Hyperstudio

application/ipfix
.ipfix
Internet Protocol Flow Information Export

application/java-archive
.jar
Java Archive

application/java-serialized-object
.ser
Java Serialized Object

application/java-vm
.class
Java Bytecode File

application/javascript
.js
JavaScript

application/json
.json
JavaScript Object Notation (JSON)

application/mac-binhex40
.hqx
Macintosh BinHex 4.0

application/mac-compactpro
.cpt
Compact Pro

application/mads+xml
.mads
Metadata Authority Description Schema

application/marc
.mrc
MARC Formats

application/marcxml+xml
.mrcx
MARC21 XML Schema

application/mathematica
.ma
Mathematica Notebooks

application/mathml+xml
.mathml
Mathematical Markup Language

application/mbox
.mbox
Mbox database files

application/mediaservercontrol+xml
.mscml
Media Server Control Markup Language

application/metalink4+xml
.meta4
Metalink

application/mets+xml
.mets
Metadata Encoding and Transmission Standard

application/mods+xml
.mods
Metadata Object Description Schema

application/mp21
.m21
MPEG-21

application/mp4
.mp4
MPEG4

application/msword
.doc
Microsoft Word

application/mxf
.mxf
Material Exchange Format

application/octet-stream
.bin
Binary Data

application/oda
.oda
Office Document Architecture

application/oebps-package+xml
.opf
Open eBook Publication Structure

application/ogg
.ogx
Ogg

application/onenote
.onetoc
Microsoft OneNote

application/patch-ops-error+xml
.xer
XML Patch Framework

application/pdf
.pdf
Adobe Portable Document Format

application/pgp-encrypted
.pgp
Pretty Good Privacy

application/pgp-signature
.pgp
Pretty Good Privacy — Signature

application/pics-rules
.prf
PICSRules

application/pkcs10
.p10
PKCS #10 — Certification Request Standard

application/pkcs7-mime
.p7m
PKCS #7 — Cryptographic Message Syntax Standard

application/pkcs7-signature
.p7s
PKCS #7 — Cryptographic Message Syntax Standard

application/pkcs8
.p8
PKCS #8 — Private-Key Information Syntax Standard

application/pkix-attr-cert
.ac
Attribute Certificate

application/pkix-cert
.cer
Internet Public Key Infrastructure — Certificate

application/pkix-crl
.crl
Internet Public Key Infrastructure — Certificate Revocation Lists

application/pkix-pkipath
.pkipath
Internet Public Key Infrastructure — Certification Path

application/pkixcmp
.pki
Internet Public Key Infrastructure — Certificate Management Protocole

application/pls+xml
.pls
Pronunciation Lexicon Specification

application/postscript
.ai
PostScript

application/prs.cww
.cww
CU-Writer

application/pskc+xml
.pskcxml
Portable Symmetric Key Container

application/rdf+xml
.rdf
Resource Description Framework

application/reginfo+xml
.rif
IMS Networks

application/relax-ng-compact-syntax
.rnc
Relax NG Compact Syntax

application/resource-lists-diff+xml
.rld
XML Resource Lists Diff

application/resource-lists+xml
.rl
XML Resource Lists

application/rls-services+xml
.rs
XML Resource Lists

application/rsd+xml
.rsd
Really Simple Discovery

application/rss+xml
.rss, .xml
RSS — Really Simple Syndication

application/rtf
.rtf
Rich Text Format

application/sbml+xml
.sbml
Systems Biology Markup Language

application/scvp-cv-request
.scq
Server-Based Certificate Validation Protocol — Validation Request

application/scvp-cv-response
.scs
Server-Based Certificate Validation Protocol — Validation Response

application/scvp-vp-request
.spq
Server-Based Certificate Validation Protocol — Validation Policies — Request

application/scvp-vp-response
.spp
Server-Based Certificate Validation Protocol — Validation Policies — Response

application/sdp
.sdp
Session Description Protocol

application/set-payment-initiation
.setpay
Secure Electronic Transaction — Payment

application/set-registration-initiation
.setreg
Secure Electronic Transaction — Registration

application/shf+xml
.shf
S Hexdump Format

application/smil+xml
.smi
Synchronized Multimedia Integration Language

application/sparql-query
.rq
SPARQL — Query

application/sparql-results+xml
.srx
SPARQL — Results

application/srgs
.gram
Speech Recognition Grammar Specification

application/srgs+xml
.grxml
Speech Recognition Grammar Specification — XML

application/sru+xml
.sru
Search/Retrieve via URL Response Format

application/ssml+xml
.ssml
Speech Synthesis Markup Language

application/tei+xml
.tei
Text Encoding and Interchange

application/thraud+xml
.tfi
Sharing Transaction Fraud Data

application/timestamped-data
.tsd
Time Stamped Data Envelope

application/vnd.3gpp.pic-bw-large
.plb
3rd Generation Partnership Project — Pic Large

application/vnd.3gpp.pic-bw-small
.psb
3rd Generation Partnership Project — Pic Small

application/vnd.3gpp.pic-bw-var
.pvb
3rd Generation Partnership Project — Pic Var

application/vnd.3gpp2.tcap
.tcap
3rd Generation Partnership Project — Transaction Capabilities Application Part

application/vnd.3m.post-it-notes
.pwn
3M Post It Notes

application/vnd.accpac.simply.aso
.aso
Simply Accounting

application/vnd.accpac.simply.imp
.imp
Simply Accounting — Data Import

application/vnd.acucobol
.acu
ACU Cobol

application/vnd.acucorp
.atc
ACU Cobol

application/vnd.adobe.air-application-installer-package+zip
.air
Adobe AIR Application

application/vnd.adobe.fxp
.fxp
Adobe Flex Project

application/vnd.adobe.xdp+xml
.xdp
Adobe XML Data Package

application/vnd.adobe.xfdf
.xfdf
Adobe XML Forms Data Format

application/vnd.ahead.space
.ahead
Ahead AIR Application

application/vnd.airzip.filesecure.azf
.azf
AirZip FileSECURE

application/vnd.airzip.filesecure.azs
.azs
AirZip FileSECURE

application/vnd.amazon.ebook
.azw
Amazon Kindle eBook format

application/vnd.americandynamics.acc
.acc
Active Content Compression

application/vnd.amiga.ami
.ami
AmigaDE

application/vnd.android.package-archive
.apk
Android Package Archive

application/vnd.anser-web-certificate-issue-initiation
.cii
ANSER-WEB Terminal Client — Certificate Issue

application/vnd.anser-web-funds-transfer-initiation
.fti
ANSER-WEB Terminal Client — Web Funds Transfer

application/vnd.antix.game-component
.atx
Antix Game Player

application/vnd.apple.installer+xml
.mpkg
Apple Installer Package

application/vnd.apple.mpegurl
.m3u8
Multimedia Playlist Unicode

application/vnd.aristanetworks.swi
.swi
Arista Networks Software Image

application/vnd.audiograph
.aep
Audiograph

application/vnd.blueice.multipass
.mpm
Blueice Research Multipass

application/vnd.bmi
.bmi
BMI Drawing Data Interchange

application/vnd.businessobjects
.rep
BusinessObjects

application/vnd.chemdraw+xml
.cdxml
CambridgeSoft Chem Draw

application/vnd.chipnuts.karaoke-mmd
.mmd
Karaoke on Chipnuts Chipsets

application/vnd.cinderella
.cdy
Interactive Geometry Software Cinderella

application/vnd.claymore
.cla
Claymore Data Files

application/vnd.cloanto.rp9
.rp9
RetroPlatform Player

application/vnd.clonk.c4group
.c4g
Clonk Game

application/vnd.cluetrust.cartomobile-config
.c11amc
ClueTrust CartoMobile — Config

application/vnd.cluetrust.cartomobile-config-pkg
.c11amz
ClueTrust CartoMobile — Config Package

application/vnd.commonspace
.csp
Sixth Floor Media — CommonSpace

application/vnd.contact.cmsg
.cdbcmsg
CIM Database

application/vnd.cosmocaller
.cmc
CosmoCaller

application/vnd.crick.clicker
.clkx
CrickSoftware — Clicker

application/vnd.crick.clicker.keyboard
.clkk
CrickSoftware — Clicker — Keyboard

application/vnd.crick.clicker.palette
.clkp
CrickSoftware — Clicker — Palette

application/vnd.crick.clicker.template
.clkt
CrickSoftware — Clicker — Template

application/vnd.crick.clicker.wordbank
.clkw
CrickSoftware — Clicker — Wordbank

application/vnd.criticaltools.wbs+xml
.wbs
Critical Tools — PERT Chart EXPERT

application/vnd.ctc-posml
.pml
PosML

application/vnd.cups-ppd
.ppd
Adobe PostScript Printer Description File Format

application/vnd.curl.car
.car
CURL Applet

application/vnd.curl.pcurl
.pcurl
CURL Applet

application/vnd.data-vision.rdz
.rdz
RemoteDocs R-Viewer

application/vnd.denovo.fcselayout-link
.fe_launch
FCS Express Layout Link

application/vnd.dna
.dna
New Moon Liftoff/DNA

application/vnd.dolby.mlp
.mlp
Dolby Meridian Lossless Packing

application/vnd.dpgraph
.dpg
DPGraph

application/vnd.dreamfactory
.dfac
DreamFactory

application/vnd.dvb.ait
.ait
Digital Video Broadcasting

application/vnd.dvb.service
.svc
Digital Video Broadcasting

application/vnd.dynageo
.geo
DynaGeo

application/vnd.ecowin.chart
.mag
EcoWin Chart

application/vnd.enliven
.nml
Enliven Viewer

application/vnd.epson.esf
.esf
QUASS Stream Player

application/vnd.epson.msf
.msf
QUASS Stream Player

application/vnd.epson.quickanime
.qam
QuickAnime Player

application/vnd.epson.salt
.slt
SimpleAnimeLite Player

application/vnd.epson.ssf
.ssf
QUASS Stream Player

application/vnd.eszigno3+xml
.es3
MICROSEC e-Szign¢

application/vnd.ezpix-album
.ez2
EZPix Secure Photo Album

application/vnd.ezpix-package
.ez3
EZPix Secure Photo Album

application/vnd.fdf
.fdf
Forms Data Format

application/vnd.fdsn.seed
.seed
Digital Siesmograph Networks — SEED Datafiles

application/vnd.flographit
.gph
NpGraphIt

application/vnd.fluxtime.clip
.ftc
FluxTime Clip

application/vnd.framemaker
.fm
FrameMaker Normal Format

application/vnd.frogans.fnc
.fnc
Frogans Player

application/vnd.frogans.ltf
.ltf
Frogans Player

application/vnd.fsc.weblaunch
.fsc
Friendly Software Corporation

application/vnd.fujitsu.oasys
.oas
Fujitsu Oasys

application/vnd.fujitsu.oasys2
.oa2
Fujitsu Oasys

application/vnd.fujitsu.oasys3
.oa3
Fujitsu Oasys

application/vnd.fujitsu.oasysgp
.fg5
Fujitsu Oasys

application/vnd.fujitsu.oasysprs
.bh2
Fujitsu Oasys

application/vnd.fujixerox.ddd
.ddd
Fujitsu — Xerox 2D CAD Data

application/vnd.fujixerox.docuworks
.xdw
Fujitsu — Xerox DocuWorks

application/vnd.fujixerox.docuworks.binder
.xbd
Fujitsu — Xerox DocuWorks Binder

application/vnd.fuzzysheet
.fzs
FuzzySheet

application/vnd.genomatix.tuxedo
.txd
Genomatix Tuxedo Framework

application/vnd.geogebra.file
.ggb
GeoGebra

application/vnd.geogebra.tool
.ggt
GeoGebra

application/vnd.geometry-explorer
.gex
GeoMetry Explorer

application/vnd.geonext
.gxt
GEONExT and JSXGraph

application/vnd.geoplan
.g2w
GeoplanW

application/vnd.geospace
.g3w
GeospacW

application/vnd.gmx
.gmx
GameMaker ActiveX

application/vnd.google-earth.kml+xml
.kml
Google Earth — KML

application/vnd.google-earth.kmz
.kmz
Google Earth — Zipped KML

application/vnd.grafeq
.gqf
GrafEq

application/vnd.groove-account
.gac
Groove — Account

application/vnd.groove-help
.ghf
Groove — Help

application/vnd.groove-identity-message
.gim
Groove — Identity Message

application/vnd.groove-injector
.grv
Groove — Injector

application/vnd.groove-tool-message
.gtm
Groove — Tool Message

application/vnd.groove-tool-template
.tpl
Groove — Tool Template

application/vnd.groove-vcard
.vcg
Groove — Vcard

application/vnd.hal+xml
.hal
Hypertext Application Language

application/vnd.handheld-entertainment+xml
.zmm
ZVUE Media Manager

application/vnd.hbci
.hbci
Homebanking Computer Interface (HBCI)

application/vnd.hhe.lesson-player
.les
Archipelago Lesson Player

application/vnd.hp-hpgl
.hpgl
HP-GL/2 and HP RTL

application/vnd.hp-hpid
.hpid
Hewlett Packard Instant Delivery

application/vnd.hp-hps
.hps
Hewlett-Packard’s WebPrintSmart

application/vnd.hp-jlyt
.jlt
HP Indigo Digital Press — Job Layout Languate

application/vnd.hp-pcl
.pcl
HP Printer Command Language

application/vnd.hp-pclxl
.pclxl
PCL 6 Enhanced (Formely PCL XL)

application/vnd.hydrostatix.sof-data
.sfd-hdstx
Hydrostatix Master Suite

application/vnd.hzn-3d-crossword
.x3d
3D Crossword Plugin

application/vnd.ibm.minipay
.mpy
MiniPay

application/vnd.ibm.modcap
.afp
MO:DCA-P

application/vnd.ibm.rights-management
.irm
IBM DB2 Rights Manager

application/vnd.ibm.secure-container
.sc
IBM Electronic Media Management System — Secure Container

application/vnd.iccprofile
.icc
ICC profile

application/vnd.igloader
.igl
igLoader

application/vnd.immervision-ivp
.ivp
ImmerVision PURE Players

application/vnd.immervision-ivu
.ivu
ImmerVision PURE Players

application/vnd.insors.igm
.igm
IOCOM Visimeet

application/vnd.intercon.formnet
.xpw
Intercon FormNet

application/vnd.intergeo
.i2g
Interactive Geometry Software

application/vnd.intu.qbo
.qbo
Open Financial Exchange

application/vnd.intu.qfx
.qfx
Quicken

application/vnd.ipunplugged.rcprofile
.rcprofile
IP Unplugged Roaming Client

application/vnd.irepository.package+xml
.irp
iRepository / Lucidoc Editor

application/vnd.is-xpr
.xpr
Express by Infoseek

application/vnd.isac.fcs
.fcs
International Society for Advancement of Cytometry

application/vnd.jam
.jam
Lightspeed Audio Lab

application/vnd.jcp.javame.midlet-rms
.rms
Mobile Information Device Profile

application/vnd.jisp
.jisp
RhymBox

application/vnd.joost.joda-archive
.joda
Joda Archive

application/vnd.kahootz
.ktz
Kahootz

application/vnd.kde.karbon
.karbon
KDE KOffice Office Suite — Karbon

application/vnd.kde.kchart
.chrt
KDE KOffice Office Suite — KChart

application/vnd.kde.kformula
.kfo
KDE KOffice Office Suite — Kformula

application/vnd.kde.kivio
.flw
KDE KOffice Office Suite — Kivio

application/vnd.kde.kontour
.kon
KDE KOffice Office Suite — Kontour

application/vnd.kde.kpresenter
.kpr
KDE KOffice Office Suite — Kpresenter

application/vnd.kde.kspread
.ksp
KDE KOffice Office Suite — Kspread

application/vnd.kde.kword
.kwd
KDE KOffice Office Suite — Kword

application/vnd.kenameaapp
.htke
Kenamea App

application/vnd.kidspiration
.kia
Kidspiration

application/vnd.kinar
.kne
Kinar Applications

application/vnd.koan
.skp
SSEYO Koan Play File

application/vnd.kodak-descriptor
.sse
Kodak Storyshare

application/vnd.las.las+xml
.lasxml
Laser App Enterprise

application/vnd.llamagraphics.life-balance.desktop
.lbd
Life Balance — Desktop Edition

application/vnd.llamagraphics.life-balance.exchange+xml
.lbe
Life Balance — Exchange Format

application/vnd.lotus-1-2-3
0,123
Lotus 1-2-3

application/vnd.lotus-approach
.apr
Lotus Approach

application/vnd.lotus-freelance
.pre
Lotus Freelance

application/vnd.lotus-notes
.nsf
Lotus Notes

application/vnd.lotus-organizer
.org
Lotus Organizer

application/vnd.lotus-screencam
.scm
Lotus Screencam

application/vnd.lotus-wordpro
.lwp
Lotus Wordpro

application/vnd.macports.portpkg
.portpkg
MacPorts Port System

application/vnd.mcd
.mcd
Micro CADAM Helix D&D

application/vnd.medcalcdata
.mc1
MedCalc

application/vnd.mediastation.cdkey
.cdkey
MediaRemote

application/vnd.mfer
.mwf
Medical Waveform Encoding Format

application/vnd.mfmp
.mfm
Melody Format for Mobile Platform

application/vnd.micrografx.flo
.flo
Micrografx

application/vnd.micrografx.igx
.igx
Micrografx iGrafx Professional

application/vnd.mif
.mif
FrameMaker Interchange Format

application/vnd.mobius.daf
.daf
Mobius Management Systems — UniversalArchive

application/vnd.mobius.dis
.dis
Mobius Management Systems — Distribution Database

application/vnd.mobius.mbk
.mbk
Mobius Management Systems — Basket file

application/vnd.mobius.mqy
.mqy
Mobius Management Systems — Query File

application/vnd.mobius.msl
.msl
Mobius Management Systems — Script Language

application/vnd.mobius.plc
.plc
Mobius Management Systems — Policy Definition Language File

application/vnd.mobius.txf
.txf
Mobius Management Systems — Topic Index File

application/vnd.mophun.application
.mpn
Mophun VM

application/vnd.mophun.certificate
.mpc
Mophun Certificate

application/vnd.mozilla.xul+xml
.xul
XUL — XML User Interface Language

application/vnd.ms-artgalry
.cil
Microsoft Artgalry

application/vnd.ms-cab-compressed
.cab
Microsoft Cabinet File

application/vnd.ms-excel
.xls
Microsoft Excel

application/vnd.ms-excel.addin.macroenabled.12
.xlam
Microsoft Excel — Add-In File

application/vnd.ms-excel.sheet.binary.macroenabled.12
.xlsb
Microsoft Excel — Binary Workbook

application/vnd.ms-excel.sheet.macroenabled.12
.xlsm
Microsoft Excel — Macro-Enabled Workbook

application/vnd.ms-excel.template.macroenabled.12
.xltm
Microsoft Excel — Macro-Enabled Template File

application/vnd.ms-fontobject
.eot
Microsoft Embedded OpenType

application/vnd.ms-htmlhelp
.chm
Microsoft Html Help File

application/vnd.ms-ims
.ims
Microsoft Class Server

application/vnd.ms-lrm
.lrm
Microsoft Learning Resource Module

application/vnd.ms-officetheme
.thmx
Microsoft Office System Release Theme

application/vnd.ms-pki.seccat
.cat
Microsoft Trust UI Provider — Security Catalog

application/vnd.ms-pki.stl
.stl
Microsoft Trust UI Provider — Certificate Trust Link

application/vnd.ms-powerpoint
.ppt
Microsoft PowerPoint

application/vnd.ms-powerpoint.addin.macroenabled.12
.ppam
Microsoft PowerPoint — Add-in file

application/vnd.ms-powerpoint.presentation.macroenabled.12
.pptm
Microsoft PowerPoint — Macro-Enabled Presentation File

application/vnd.ms-powerpoint.slide.macroenabled.12
.sldm
Microsoft PowerPoint — Macro-Enabled Open XML Slide

application/vnd.ms-powerpoint.slideshow.macroenabled.12
.ppsm
Microsoft PowerPoint — Macro-Enabled Slide Show File

application/vnd.ms-powerpoint.template.macroenabled.12
.potm
Microsoft PowerPoint — Macro-Enabled Template File

application/vnd.ms-project
.mpp
Microsoft Project

application/vnd.ms-word.document.macroenabled.12
.docm
Microsoft Word — Macro-Enabled Document

application/vnd.ms-word.template.macroenabled.12
.dotm
Microsoft Word — Macro-Enabled Template

application/vnd.ms-works
.wps
Microsoft Works

application/vnd.ms-wpl
.wpl
Microsoft Windows Media Player Playlist

application/vnd.ms-xpsdocument
.xps
Microsoft XML Paper Specification

application/vnd.mseq
.mseq
3GPP MSEQ File

application/vnd.musician
.mus
MUsical Score Interpreted Code Invented for the ASCII designation of Notation

application/vnd.muvee.style
.msty
Muvee Automatic Video Editing

application/vnd.neurolanguage.nlu
.nlu
neuroLanguage

application/vnd.noblenet-directory
.nnd
NobleNet Directory

application/vnd.noblenet-sealer
.nns
NobleNet Sealer

application/vnd.noblenet-web
.nnw
NobleNet Web

application/vnd.nokia.n-gage.data
.ngdat
N-Gage Game Data

application/vnd.nokia.n-gage.symbian.install
.n-gage
N-Gage Game Installer

application/vnd.nokia.radio-preset
.rpst
Nokia Radio Application — Preset

application/vnd.nokia.radio-presets
.rpss
Nokia Radio Application — Preset

application/vnd.novadigm.edm
.edm
Novadigm’s RADIA and EDM products

application/vnd.novadigm.edx
.edx
Novadigm’s RADIA and EDM products

application/vnd.novadigm.ext
.ext
Novadigm’s RADIA and EDM products

application/vnd.oasis.opendocument.chart
.odc
OpenDocument Chart

application/vnd.oasis.opendocument.chart-template
.otc
OpenDocument Chart Template

application/vnd.oasis.opendocument.database
.odb
OpenDocument Database

application/vnd.oasis.opendocument.formula
.odf
OpenDocument Formula

application/vnd.oasis.opendocument.formula-template
.odft
OpenDocument Formula Template

application/vnd.oasis.opendocument.graphics
.odg
OpenDocument Graphics

application/vnd.oasis.opendocument.graphics-template
.otg
OpenDocument Graphics Template

application/vnd.oasis.opendocument.image
.odi
OpenDocument Image

application/vnd.oasis.opendocument.image-template
.oti
OpenDocument Image Template

application/vnd.oasis.opendocument.presentation
.odp
OpenDocument Presentation

application/vnd.oasis.opendocument.presentation-template
.otp
OpenDocument Presentation Template

application/vnd.oasis.opendocument.spreadsheet
.ods
OpenDocument Spreadsheet

application/vnd.oasis.opendocument.spreadsheet-template
.ots
OpenDocument Spreadsheet Template

application/vnd.oasis.opendocument.text
.odt
OpenDocument Text

application/vnd.oasis.opendocument.text-master
.odm
OpenDocument Text Master

application/vnd.oasis.opendocument.text-template
.ott
OpenDocument Text Template

application/vnd.oasis.opendocument.text-web
.oth
Open Document Text Web

application/vnd.olpc-sugar
.xo
Sugar Linux Application Bundle

application/vnd.oma.dd2+xml
.dd2
OMA Download Agents

application/vnd.openofficeorg.extension
.oxt
Open Office Extension

application/vnd.openxmlformats-officedocument.presentationml.presentation
.pptx
Microsoft Office — OOXML — Presentation

application/vnd.openxmlformats-officedocument.presentationml.slide
.sldx
Microsoft Office — OOXML — Presentation (Slide)

application/vnd.openxmlformats-officedocument.presentationml.slideshow
.ppsx
Microsoft Office — OOXML — Presentation (Slideshow)

application/vnd.openxmlformats-officedocument.presentationml.template
.potx
Microsoft Office — OOXML — Presentation Template

application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
.xlsx
Microsoft Office — OOXML — Spreadsheet

application/vnd.openxmlformats-officedocument.spreadsheetml.template
.xltx
Microsoft Office — OOXML — Spreadsheet Template

application/vnd.openxmlformats-officedocument.wordprocessingml.document
.docx
Microsoft Office — OOXML — Word Document

application/vnd.openxmlformats-officedocument.wordprocessingml.template
.dotx
Microsoft Office — OOXML — Word Document Template

application/vnd.osgeo.mapguide.package
.mgp
MapGuide DBXML

application/vnd.osgi.dp
.dp
OSGi Deployment Package

application/vnd.palm
.pdb
PalmOS Data

application/vnd.pawaafile
.paw
PawaaFILE

application/vnd.pg.format
.str
Proprietary P&G Standard Reporting System

application/vnd.pg.osasli
.ei6
Proprietary P&G Standard Reporting System

application/vnd.picsel
.efif
Pcsel eFIF File

application/vnd.pmi.widget
.wg
Qualcomm’s Plaza Mobile Internet

application/vnd.pocketlearn
.plf
PocketLearn Viewers

application/vnd.powerbuilder6
.pbd
PowerBuilder

application/vnd.previewsystems.box
.box
Preview Systems ZipLock/VBox

application/vnd.proteus.magazine
.mgz
EFI Proteus

application/vnd.publishare-delta-tree
.qps
PubliShare Objects

application/vnd.pvi.ptid1
.ptid
Princeton Video Image

application/vnd.quark.quarkxpress
.qxd
QuarkXpress

application/vnd.realvnc.bed
.bed
RealVNC

application/vnd.recordare.musicxml
.mxl
Recordare Applications

application/vnd.recordare.musicxml+xml
.musicxml
Recordare Applications

application/vnd.rig.cryptonote
.cryptonote
CryptoNote

application/vnd.rim.cod
.cod
Blackberry COD File

application/vnd.rn-realmedia
.rm
RealMedia

application/vnd.route66.link66+xml
.link66
ROUTE 66 Location Based Services

application/vnd.sailingtracker.track
.st
SailingTracker

application/vnd.seemail
.see
SeeMail

application/vnd.sema
.sema
Secured eMail

application/vnd.semd
.semd
Secured eMail

application/vnd.semf
.semf
Secured eMail

application/vnd.shana.informed.formdata
.ifm
Shana Informed Filler

application/vnd.shana.informed.formtemplate
.itp
Shana Informed Filler

application/vnd.shana.informed.interchange
.iif
Shana Informed Filler

application/vnd.shana.informed.package
.ipk
Shana Informed Filler

application/vnd.simtech-mindmapper
.twd
SimTech MindMapper

application/vnd.smaf
.mmf
SMAF File

application/vnd.smart.teacher
.teacher
SMART Technologies Apps

application/vnd.solent.sdkm+xml
.sdkm
SudokuMagic

application/vnd.spotfire.dxp
.dxp
TIBCO Spotfire

application/vnd.spotfire.sfs
.sfs
TIBCO Spotfire

application/vnd.stardivision.calc
.sdc
StarOffice — Calc

application/vnd.stardivision.draw
.sda
StarOffice — Draw

application/vnd.stardivision.impress
.sdd
StarOffice — Impress

application/vnd.stardivision.math
.smf
StarOffice — Math

application/vnd.stardivision.writer
.sdw
StarOffice — Writer

application/vnd.stardivision.writer-global
.sgl
StarOffice — Writer (Global)

application/vnd.stepmania.stepchart
.sm
StepMania

application/vnd.sun.xml.calc
.sxc
OpenOffice — Calc (Spreadsheet)

application/vnd.sun.xml.calc.template
.stc
OpenOffice — Calc Template (Spreadsheet)

application/vnd.sun.xml.draw
.sxd
OpenOffice — Draw (Graphics)

application/vnd.sun.xml.draw.template
.std
OpenOffice — Draw Template (Graphics)

application/vnd.sun.xml.impress
.sxi
OpenOffice — Impress (Presentation)

application/vnd.sun.xml.impress.template
.sti
OpenOffice — Impress Template (Presentation)

application/vnd.sun.xml.math
.sxm
OpenOffice — Math (Formula)

application/vnd.sun.xml.writer
.sxw
OpenOffice — Writer (Text — HTML)

application/vnd.sun.xml.writer.global
.sxg
OpenOffice — Writer (Text — HTML)

application/vnd.sun.xml.writer.template
.stw
OpenOffice — Writer Template (Text — HTML)

application/vnd.sus-calendar
.sus
ScheduleUs

application/vnd.svd
.svd
SourceView Document

application/vnd.symbian.install
.sis
Symbian Install Package

application/vnd.syncml.dm+wbxml
.bdm
SyncML — Device Management

application/vnd.syncml.dm+xml
.xdm
SyncML — Device Management

application/vnd.syncml+xml
.xsm
SyncML

application/vnd.tao.intent-module-archive
.tao
Tao Intent

application/vnd.tmobile-livetv
.tmo
MobileTV

application/vnd.trid.tpt
.tpt
TRI Systems Config

application/vnd.triscape.mxs
.mxs
Triscape Map Explorer

application/vnd.trueapp
.tra
True BASIC

application/vnd.ufdl
.ufd
Universal Forms Description Language

application/vnd.uiq.theme
.utz
User Interface Quartz — Theme (Symbian)

application/vnd.umajin
.umj
UMAJIN

application/vnd.unity
.unityweb
Unity 3d

application/vnd.uoml+xml
.uoml
Unique Object Markup Language

application/vnd.vcx
.vcx
VirtualCatalog

application/vnd.visio
.vsd
Microsoft Visio

application/vnd.visio2013
.vsdx
Microsoft Visio 2013

application/vnd.visionary
.vis
Visionary

application/vnd.vsf
.vsf
Viewport+

application/vnd.wap.wbxml
.wbxml
WAP Binary XML (WBXML)

application/vnd.wap.wmlc
.wmlc
Compiled Wireless Markup Language (WMLC)

application/vnd.wap.wmlscriptc
.wmlsc
WMLScript

application/vnd.webturbo
.wtb
WebTurbo

application/vnd.wolfram.player
.nbp
Mathematica Notebook Player

application/vnd.wordperfect
.wpd
Wordperfect

application/vnd.wqd
.wqd
SundaHus WQ

application/vnd.wt.stf
.stf
Worldtalk

application/vnd.xara
.xar
CorelXARA

application/vnd.xfdl
.xfdl
Extensible Forms Description Language

application/vnd.yamaha.hv-dic
.hvd
HV Voice Dictionary

application/vnd.yamaha.hv-script
.hvs
HV Script

application/vnd.yamaha.hv-voice
.hvp
HV Voice Parameter

application/vnd.yamaha.openscoreformat
.osf
Open Score Format

application/vnd.yamaha.openscoreformat.osfpvg+xml
.osfpvg
OSFPVG

application/vnd.yamaha.smaf-audio
.saf
SMAF Audio

application/vnd.yamaha.smaf-phrase
.spf
SMAF Phrase

application/vnd.yellowriver-custom-menu
.cmp
CustomMenu

application/vnd.zul
.zir
Z.U.L. Geometry

application/vnd.zzazz.deck+xml
.zaz
Zzazz Deck

application/voicexml+xml
.vxml
VoiceXML

application/widget
.wgt
Widget Packaging and XML Configuration

application/winhlp
.hlp
WinHelp

application/wsdl+xml
.wsdl
WSDL — Web Services Description Language

application/wspolicy+xml
.wspolicy
Web Services Policy

application/x-7z-compressed
.7z
7-Zip

application/x-abiword
.abw
AbiWord

application/x-ace-compressed
.ace
Ace Archive

application/x-apple-diskimage
.dmg
Apple Disk Image

application/x-authorware-bin
.aab
Adobe (Macropedia) Authorware — Binary File

application/x-authorware-map
.aam
Adobe (Macropedia) Authorware — Map

application/x-authorware-seg
.aas
Adobe (Macropedia) Authorware — Segment File

application/x-bcpio
.bcpio
Binary CPIO Archive

application/x-bittorrent
.torrent
BitTorrent

application/x-bzip
.bz
Bzip Archive

application/x-bzip2
.bz2
Bzip2 Archive

application/x-cdlink
.vcd
Video CD

application/x-chat
.chat
pIRCh

application/x-chess-pgn
.pgn
Portable Game Notation (Chess Games)

application/x-cpio
.cpio
CPIO Archive

application/x-csh
.csh
C Shell Script

application/x-debian-package
.deb
Debian Package

application/x-director
.dir
Adobe Shockwave Player

application/x-doom
.wad
Doom Video Game

application/x-dtbncx+xml
.ncx
Navigation Control file for XML (for ePub)

application/x-dtbook+xml
.dtb
Digital Talking Book

application/x-dtbresource+xml
.res
Digital Talking Book — Resource File

application/x-dvi
.dvi
Device Independent File Format (DVI)

application/x-font-bdf
.bdf
Glyph Bitmap Distribution Format

application/x-font-ghostscript
.gsf
Ghostscript Font

application/x-font-linux-psf
.psf
PSF Fonts

application/x-font-otf
.otf
OpenType Font File

application/x-font-pcf
.pcf
Portable Compiled Format

application/x-font-snf
.snf
Server Normal Format

application/x-font-ttf
.ttf
TrueType Font

application/x-font-type1
.pfa
PostScript Fonts

application/x-font-woff
.woff
Web Open Font Format

application/x-futuresplash
.spl
FutureSplash Animator

application/x-gnumeric
.gnumeric
Gnumeric

application/x-gtar
.gtar
GNU Tar Files

application/x-hdf
.hdf
Hierarchical Data Format

application/x-java-jnlp-file
.jnlp
Java Network Launching Protocol

application/x-latex
.latex
LaTeX

application/x-mobipocket-ebook
.prc
Mobipocket

application/x-ms-application
.application
Microsoft ClickOnce

application/x-ms-wmd
.wmd
Microsoft Windows Media Player Download Package

application/x-ms-wmz
.wmz
Microsoft Windows Media Player Skin Package

application/x-ms-xbap
.xbap
Microsoft XAML Browser Application

application/x-msaccess
.mdb
Microsoft Access

application/x-msbinder
.obd
Microsoft Office Binder

application/x-mscardfile
.crd
Microsoft Information Card

application/x-msclip
.clp
Microsoft Clipboard Clip

application/x-msdownload
.exe
Microsoft Application

application/x-msmediaview
.mvb
Microsoft MediaView

application/x-msmetafile
.wmf
Microsoft Windows Metafile

application/x-msmoney
.mny
Microsoft Money

application/x-mspublisher
.pub
Microsoft Publisher

application/x-msschedule
.scd
Microsoft Schedule+

application/x-msterminal
.trm
Microsoft Windows Terminal Services

application/x-mswrite
.wri
Microsoft Wordpad

application/x-netcdf
.nc
Network Common Data Form (NetCDF)

application/x-pkcs12
.p12
PKCS #12 — Personal Information Exchange Syntax Standard

application/x-pkcs7-certificates
.p7b
PKCS #7 — Cryptographic Message Syntax Standard (Certificates)

application/x-pkcs7-certreqresp
.p7r
PKCS #7 — Cryptographic Message Syntax Standard (Certificate Request Response)

application/x-rar-compressed
.rar
RAR Archive

application/x-sh
.sh
Bourne Shell Script

application/x-shar
.shar
Shell Archive

application/x-shockwave-flash
.swf
Adobe Flash

application/x-silverlight-app
.xap
Microsoft Silverlight

application/x-stuffit
.sit
Stuffit Archive

application/x-stuffitx
.sitx
Stuffit Archive

application/x-sv4cpio
.sv4cpio
System V Release 4 CPIO Archive

application/x-sv4crc
.sv4crc
System V Release 4 CPIO Checksum Data

application/x-tar
.tar
Tar File (Tape Archive)

application/x-tcl
.tcl
Tcl Script

application/x-tex
.tex
TeX

application/x-tex-tfm
.tfm
TeX Font Metric

application/x-texinfo
.texinfo
GNU Texinfo Document

application/x-ustar
.ustar
Ustar (Uniform Standard Tape Archive)

application/x-wais-source
.src
WAIS Source

application/x-x509-ca-cert
.der
X.509 Certificate

application/x-xfig
.fig
Xfig

application/x-xpinstall
.xpi
XPInstall — Mozilla

application/xcap-diff+xml
.xdf
XML Configuration Access Protocol — XCAP Diff

application/xenc+xml
.xenc
XML Encryption Syntax and Processing

application/xhtml+xml
.xhtml
XHTML — The Extensible HyperText Markup Language

application/xml
.xml
XML — Extensible Markup Language

application/xml-dtd
.dtd
Document Type Definition

application/xop+xml
.xop
XML-Binary Optimized Packaging

application/xslt+xml
.xslt
XML Transformations

application/xspf+xml
.xspf
XSPF — XML Shareable Playlist Format

application/xv+xml
.mxml
MXML

application/yang
.yang
YANG Data Modeling Language

application/yin+xml
.yin
YIN (YANG — XML)

application/zip
.zip
Zip Archive

From Wikipedia Media type,

A media type is composed of a type, a subtype, and optional
parameters. As an example, an HTML file might be designated text/html; charset=UTF-8.

Media type consists of top-level type name and sub-type name, which is
further structured into so-called «trees».

top-level type name / subtype name [ ; parameters ]

top-level type name / [ tree. ] subtype name [ +suffix ] [ ; parameters ]

All media types should be registered using the IANA registration procedures. Currently the following trees are created: standard, vendor, personal or vanity, unregistered x.

Standard:

Media types in the standards tree do not use any tree facet (prefix).

type / media type name [+suffix]

Examples: «application/xhtml+xml», «image/png»

Vendor:

Vendor tree is used for media types associated with publicly available
products. It uses vnd. facet.

type / vnd. media type name [+suffix] - used in the case of well-known producer

type / vnd. producer's name followed by media type name [+suffix] - producer's name must be approved by IANA

type / vnd. producer's name followed by product's name [+suffix] - producer's name must be approved by IANA

Personal or Vanity tree:

Personal or Vanity tree includes media types created experimentally or
as part of products that are not distributed commercially. It uses
prs. facet.

type / prs. media type name [+suffix]

Unregistered x. tree:

The «x.» tree may be used for media types intended exclusively for use
in private, local environments and only with the active agreement of
the parties exchanging them. Types in this tree cannot be registered.

According to the previous version of RFC 6838 — obsoleted RFC 2048
(published in November 1996) it should rarely, if ever, be necessary
to use unregistered experimental types, and as such use of both «x-»
and «x.» forms is discouraged
. Previous versions of that RFC — RFC
1590 and RFC 1521 stated that the use of «x-» notation for the
sub-type name may be used for unregistered and private sub-types, but
this recommendation was obsoleted in November 1996.

type / x. media type name [+suffix]

So its clear that the standard type MIME type application/pdf is the appropriate one to use while you should avoid using the obsolete and unregistered x- media type as stated in RFC 2048 and RFC 6838.

From Wikipedia Media type,

A media type is composed of a type, a subtype, and optional
parameters. As an example, an HTML file might be designated text/html; charset=UTF-8.

Media type consists of top-level type name and sub-type name, which is
further structured into so-called «trees».

top-level type name / subtype name [ ; parameters ]

top-level type name / [ tree. ] subtype name [ +suffix ] [ ; parameters ]

All media types should be registered using the IANA registration procedures. Currently the following trees are created: standard, vendor, personal or vanity, unregistered x.

Standard:

Media types in the standards tree do not use any tree facet (prefix).

type / media type name [+suffix]

Examples: «application/xhtml+xml», «image/png»

Vendor:

Vendor tree is used for media types associated with publicly available
products. It uses vnd. facet.

type / vnd. media type name [+suffix] - used in the case of well-known producer

type / vnd. producer's name followed by media type name [+suffix] - producer's name must be approved by IANA

type / vnd. producer's name followed by product's name [+suffix] - producer's name must be approved by IANA

Personal or Vanity tree:

Personal or Vanity tree includes media types created experimentally or
as part of products that are not distributed commercially. It uses
prs. facet.

type / prs. media type name [+suffix]

Unregistered x. tree:

The «x.» tree may be used for media types intended exclusively for use
in private, local environments and only with the active agreement of
the parties exchanging them. Types in this tree cannot be registered.

According to the previous version of RFC 6838 — obsoleted RFC 2048
(published in November 1996) it should rarely, if ever, be necessary
to use unregistered experimental types, and as such use of both «x-»
and «x.» forms is discouraged
. Previous versions of that RFC — RFC
1590 and RFC 1521 stated that the use of «x-» notation for the
sub-type name may be used for unregistered and private sub-types, but
this recommendation was obsoleted in November 1996.

type / x. media type name [+suffix]

So its clear that the standard type MIME type application/pdf is the appropriate one to use while you should avoid using the obsolete and unregistered x- media type as stated in RFC 2048 and RFC 6838.

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