Uploading video caption file fails

[kilink]

Uploading of video captions fails due to the way the default request executor determines mime types based on file extension; it uses a fixed mapping that doesn't include ".srt", so the Facebook API endpoint rejects the request.

A more foolproof method would be to fall back to a default mimetype such as "application/octet-stream" when one can't be determined based on file extension. Files.probeContentType could also be utilized to delegate to more sophisticated user supplied file type detectors such as Tika.

[daphyFB]

Hi, thanks for reporting the Ads API SDK bug! Since this will be addressed by #56, I'll close this issue. Thanks a lot again!