You can find every content type here: http://www.iana.org/assignments/media-types/media-types.xhtml
The most common type are:
- Type application
application/java-archive 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
- Type audio
audio/mpeg audio/x-ms-wma audio/vnd.rn-realaudio audio/x-wav
- Type image
image/gif image/jpeg image/png image/tiff image/vnd.microsoft.icon image/x-icon image/vnd.djvu image/svg+xml
- Type multipart
multipart/mixed multipart/alternative multipart/related (using by MHTML (HTML mail).) multipart/form-data
- Type text
text/css text/csv text/html text/javascript (obsolete) text/plain text/xml
- Type video
video/mpeg video/mp4 video/quicktime video/x-ms-wmv video/x-msvideo video/x-flv video/webm
- Type vnd :
application/vnd.android.package-archive 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