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ram4444's avatar
ram4444
Explorer | Level 4
3 years ago
Solved

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 ...
API
  • Greg-DB's avatar
    Greg-DB
    3 years ago

    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.

ram4444's avatar
ram4444
Explorer | Level 4
3 years ago

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's avatar
Greg-DB
Icon for Dropbox Community Moderator rankDropbox Community Moderator
3 years ago

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.

  • ram4444's avatar
    ram4444
    Explorer | Level 4
    3 years ago

    Greg-DB Great thanks for your advice and now I can send out the refresh token request.

    & Здравко Thanks for your recommendation in looking into the full HTTP request 

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