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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.
Thanks for Greg-DB and Здравко advices. I have located the problem is the Header TE generated from FUEL itself. After putting it to the POSTMAN request I can replicate the status code 503
User-Agent: FUEL
Accept: */*
Accept-Encoding: gzip, deflate, br
Cookie: locale=en; t=RzvutB7WDW79g72wIY13TQgy
Content-Type: text/plain; charset=UTF-8
TE: gzip, deflate; q=0.5
As I still cannot find any way to remove this header from the request of my code, may I know why the server will handle it and cause error (so that it can be simply ignored when receive?)
Greg-DB
Dropbox Staff
Dropbox Staffram4444 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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