Content-Type（内容类型），一般是指网页中存在的 Content-Type，用于定义网络文件的类型和网页的编码，决定浏览器将以什么形式、什么编码读取这个文件。
Content-Type 标头告诉客户端实际返回的内容的内容类型
Application
- application/EDI-X12
- application/EDIFACT
- application/javascript
- application/octet-stream
- application/ogg
- application/pdf
- application/xhtml+xml
- application/x-shockwave-flash
- application/json
- application/ld+json
- application/xml
- application/zip
- application/x-www-form-urlencoded
Audio
- audio/mpeg
- audio/x-ms-wma
- audio/vnd.rn-realaudio
- audio/x-wav
Image
- image/gif
- image/jpeg
- image/png
- image/tiff
- image/vnd.microsoft.icon
- image/x-icon
- image/vnd.djvu
- image/svg+xml
Multipart
- multipart/mixed
- multipart/alternative
- multipart/related (using by MHTML (HTML mail).)
- multipart/form-data
Text
- text/css
- text/csv
- text/html
- text/javascript (obsolete)
- text/plain
- text/xml
- Video
- video/mpeg
- video/mp4
- video/quicktime
- video/x-ms-wmv
- video/x-msvideo
- video/x-flv
- video/webm
VND
- application/vnd.oasis.opendocument.text
- application/vnd.oasis.opendocument.spreadsheet
- application/vnd.oasis.opendocument.presentation
- application/vnd.oasis.opendocument.graphics
- application/vnd.ms-excel
- application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
- application/vnd.ms-powerpoint
- application/vnd.openxmlformats-officedocument.presentationml.presentation
- application/msword
- application/vnd.openxmlformats-officedocument.wordprocessingml.document
- application/vnd.mozilla.xul+xml