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Child Item

"No auth function available for given request" return on /token request

jenseno

Hi. I send the following form data with the code I got from the authorization page. I use redirect_uri back to my app through localhost.

However I get the following response (error code 400): "No auth function available for given request".

My request form data looks like this:

Header:

POST /oauth2/token HTTP/1.1
Host: api.dropboxapi.com
User-Agent: UnityPlayer/5.5.2f1 (UnityWebRequest/1.0, libcurl/7.46.0-DEV)
Accept: */*
Accept-Encoding: identity
X-Unity-Version: 5.5.2f1
Content-Length: 177

Post data:

code=KNJIALLS_WCAAAAAAABSTZP97AYWIZJPX9B1A6CBFUC&grant_type=authorization_code&client_id=<removed for security>&client_secret=<removed for security>&redirect_uri=http%3A%2F%2F127.0.0.1%3A6756

I could not find anything on google or the forums, so now I'm trying here.

I can see that auth authorization is missing (Authorization bearer) but the docs said nothing about this, and I don't have a token at this stage in the process anyway.

Thanks in advance

Odin Jensen

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Comments

Greg-DB

I don't see anything clearly wrong with your request. To help troubleshoot this, can you share the full/raw request and response? (Just be sure to redact your app secret.)

Also, this blog post may be helpful:

https://blogs.dropbox.com/developers/2013/07/using-oauth-2-0-with-the-core-api/

jenseno

Thanks. The raw request (from Fiddler) is as follows:

POST https://api.dropboxapi.com/oauth2/token HTTP/1.1
Host: api.dropboxapi.com
User-Agent: UnityPlayer/5.6.0f3 (UnityWebRequest/1.0, libcurl/7.51.0-DEV)
Accept: */*
Accept-Encoding: identity
X-Unity-Version: 5.6.0f3
Content-Length: 177

code=KNJIALLS_WCAAAAAAABS-QAPRCDPDJ7TLVWLT2JGUFU&grant_type=authorization_code&client_id=<censored>&client_secret=<censored>&redirect_uri=http%3A%2F%2F127.0.0.1%3A6756

Greg-DB

I suspect the issue is that you're missing the "Content-Type" header. It should be "Content-Type: application/x-www-form-urlencoded". Try that and let me know if it doesn't help.

jenseno

Setting that content type returns a 500 with message internal server error?

Greg-DB

Can you include the full request and response for that? Please do include the response headers so we can look into it.

jenseno

Request:
POST https://api.dropboxapi.com/oauth2/token HTTP/1.1
Host: api.dropboxapi.com
User-Agent: UnityPlayer/5.6.0f3 (UnityWebRequest/1.0, libcurl/7.51.0-DEV)
Accept: */*
Accept-Encoding: identity
Content-Type: application/x-www-form-urlencoded
X-Unity-Version: 5.6.0f3
Content-Length: 177

code=KNJIALLS_WCAAAAAAABS_UY40OCMSQQ5VHIKCHVKFDE&grant_type=authorization_code&client_id=<secret>&client_secret=<secret>&redirect_uri=http%3A%2F%2F127.0.0.1%3A6756

Response:
HTTP/1.1 500 Internal Server Error
Server: nginx
Date: Mon, 17 Apr 2017 18:19:51 GMT
Content-Type: text/plain
Content-Length: 21
Connection: keep-alive
X-Dropbox-Request-Id: 064f4c248437db078acf3ca54396051e

Internal server error

Greg-DB

Thanks! That may have just been a transient issue on our side. Can you try once more now? Please share the X-Dropbox-Request-Id again if you still get a 500.

jenseno

Still get 500. X-Dropbox-Request-Id: 04f52af12d3fa4ab1f040ec979addd8b

Greg-DB

Thanks for letting me know. We'll look into it.

jenseno

Any chance you'd had the time to look into this? I got everything else working for next release of my app

Greg-DB

This is open with the team, but I don't have an update on it yet. I'll follow up here once I do.

jenseno

Any news? I really need this to release next version of my app and dropbox backup is the number one requested feature from my costumers

Greg-DB

This is open with the team, but I don't have an update yet.

Can you check if you're still seeing this though? I don't know what the underlying cause was yet, but it may have just been a transient issue.

jenseno

I still get the same error. If you guys have Unity installed, I can send you a sample project that produces the error?

Greg-DB

Sure, that may help us investigate. Thanks!

jenseno

Hi. I have the sample code ready. Where can I mail it securely? For your convenience, it contains my app secret keys etc.

Regards

Odin

Greg-DB

Thanks! You don't need to include the app secret, but in any case you can submit it in an API ticket here:

https://www.dropbox.com/developers/contact

jenseno

Thanks. Ive submitted instructions as wel as link to download (in my dropbox)

Just mail me if questions

Regards

Odin

bruce0205

Hi sir,
I have encountered the same problem.
It bothered me a while.
Is this the problem solved?
Could you tell me how to do?
Thanks in advance!!

jenseno

Actually my problem was that I accidentially upper cased the request code, due to copy paste og some other code

So I guess you need to make sure that the code you get from Dropbox API is not modified in any way, before you request the token

Regards

Odin

Greg-DB

@bruce0205 If that doesn't seem to be the issue in your case, please supply the code to reproduce the issue for your case.

Laurent22

In my case I had this issue because I was using the wrong content type to post the data.

This endpoint is actually very confusing because unlike all the other endpoints (which accept application/json) it accepts application/x-www-form-urlencoded, and if you use the wrong format it will respond with this absurd error message "No auth function" even though there can't be an auth token at that point.

In my tests other mistakes in the data format (like missing client ID or secret) also resulted in this error .

From the doc it's unclear whether client ID and secret are required or not (I have no idea what "If credentials are passed in POST parameters" means in this context) but they seem to be required anyway.

So in my case I eventually got it working using this kind of request:

curl -v -F 'client_id=REMOVED' -F 'client_secret=REMOVED' -F 'code=REMOVED' -F 'grant_type=authorization_code' https://api.dropboxapi.com/oauth2/token