The closest thing I could find was System.Net.Mime.MediaTypeNames but that doesn't seem to have everything (like json) since it seems to be more focused around email attachments.
Is there an enum for the ContentType property on a HttpWebResponse ("text/plain", "application/octet-stream" etc.)?
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3 Answers
An enum doesn't make much sense. MIME types are open-ended. That is, the list is not finite: new types are added from time to time.
See RFC4288: Media Type Specifications and Registration Procedures
IANA's database is most likely to be complete. Currently, they have the list available in CSV format at https://www.iana.org/assignments/media-types/application.csv. I am assuming this is a stable URL whose content changes as updates are made. If you want to stay up to date, you'd need to put together a mechanism that is appropriate for your needs.
There is also the mime.types file that comes with Apache which seems to have been derived from the said list.
If like me you wanted to have no hard-coded string in your code you can use something like below
httpHeaders.add(HttpHeaders.CONTENT_TYPE,MediaType.APPLICATION_JSON_VALUE);
which is essentially
httpHeaders.add("Content-Type","application/json");
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