What are all the possible values for HTTP “Content-Type” header?
You can find every content type here: http://www.iana.org/assignments/media-types/media-types.xhtml
The most common type are:
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Type 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
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Type audio
audio/mpeg audio/x-ms-wma audio/vnd.rn-realaudio audio/x-wav
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Type image
image/gif image/jpeg image/png image/tiff image/vnd.microsoft.icon image/x-icon image/vnd.djvu image/svg+xml
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Type multipart
multipart/mixed multipart/alternative multipart/related (using by MHTML (HTML mail).) multipart/form-data
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Type text
text/css text/csv text/html text/javascript (obsolete) text/plain text/xml
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Type video
video/mpeg video/mp4 video/quicktime video/x-ms-wmv video/x-msvideo video/x-flv video/webm
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Type 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
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Type
The Content-Type entity header is used to indicate the media type of the resource.
In responses, a Content-Type header tells the client what the content type of the returned content actually is. Browsers will do MIME sniffing in some cases and will not necessarily follow the value of this header; to prevent this behavior, the header X-Content-Type-Options can be set to nosniff.
In requests, (such as POST or PUT), the client tells the server what type of data is actually sent.
It also needs to have a MIME type of its parsed value (ignoring parameters) of either application/x-www-form-urlencoded, multipart/form-data, or text/plain.