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Service Unavailable 503
https://api.dropbox.com/oauth2/token?grant_type=refresh_token&refresh_token=<REFRESH_TOKEN>&client_id=<MYAPPID>&client_secret=<MYSECRET>
When I http POST to the above URL for refreshing Access ...
ram4444 Thanks for following up and sharing that, and apologies for the delay. (It appears your latest message may have initially been caught in a spam filter.)
Anyway, I see your client is sending a "TE" header in the request, but no "Connection" header. According to the specification, the corresponding "Connection" header value is required when setting the "TE" header. I am able to reproduce the error you see when setting "TE" and not "Connection", and I am able to resolve the error by setting both "TE" and "Connection" (specifically, "Connection: TE"). If you are not able to remove the "TE" header your client is setting, you should try to have it set "Connection: TE" as well.
Greg-DB
Dropbox Community Moderator
Dropbox Community Moderatorram4444 Thanks for following up and sharing that, and apologies for the delay. (It appears your latest message may have initially been caught in a spam filter.)
Anyway, I see your client is sending a "TE" header in the request, but no "Connection" header. According to the specification, the corresponding "Connection" header value is required when setting the "TE" header. I am able to reproduce the error you see when setting "TE" and not "Connection", and I am able to resolve the error by setting both "TE" and "Connection" (specifically, "Connection: TE"). If you are not able to remove the "TE" header your client is setting, you should try to have it set "Connection: TE" as well.
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