GAE http error 400

[esoma]

I've got an application running on Google App Engine in Python. I'm
trying to use the REST API (list.json specifically). When I fetch the
url on my local test environment everything works, but when I deploy
on to Google's service I only receive Http Error 400: Bad Request
responses. I can access other APIs (like LiveStream's) just fine.

I tried using oAuth, but got the exact same results. I've tried
performing non-api requests just to the justin.tv homepage and still
get the 400 error. Does justin.tv block GAE requests or something?

[Mike Ossareh]

Hi Esoma,

What is the URL you're trying to hit?


Cheers,

mike

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[esoma]

http://api.justin.tv/api/stream/list.json?channel=channelName1,channelName2,etc...

But like I said, I get the same status 400 response for any justin.tv
url requested from GAE's production environment.

[Mike Ossareh]

Hi Esoma,

If you give us the full request, headers and all then we'll be able to help debug this. As far as we know there is no reason for GAE to not work, but it could be something subtle like a header being set that we disagree with. So, yeah, provide us as much info as you can and we'll do our best to help you out.

Cheers,

mike

[Mike Ossareh]

A little more digging suggests this may be to do with the GAE user agent. 

Try setting one[1][2], see what happens. I'll continue to look into why this might be causing an issue.

Cheers,

mike

[1] http://stackoverflow.com/questions/2743521/how-to-change-user-agent-on-google-app-engine-urlfetch-service
[2] http://code.google.com/p/googleappengine/issues/detail?id=342

[esoma]

Alright so I diffed the headers. Only change is the User-Agent.

Development (Working):
User-Agent: AppEngine-Google; (+http://code.google.com/appengine)

Production (Error 400 Bad Request):
User-Agent: AppEngine-Google; (+http://code.google.com/appengine;
appid: s~ponystreams)

Since I can't spoof it in GAE I wrote a php script and tried with both
User-Agents on my regular website. Sure enough the production one with
"; appid: s~ponystreams" added on fails. So I tried a bunch more
changing parts around to see what works and what doesn't. Came to the
conclusion that a colon, a space, and then any other character
anywhere in the User-Agent string causes the bad request. So valid
ones might look like:

'Something : '
'Something:123'
':'
': '

Invalid:

'Something : ;'
'Something: (something else)'
': x'


I'd remove it from the User-Agent myself, but GAE doesn't allow that.

On Nov 14, 6:18 pm, Mike Ossareh <ossa...@twitch.tv> wrote:
> A little more digging suggests this may be to do with the GAE user agent.
>
> Try setting one[1][2], see what happens. I'll continue to look into why
> this might be causing an issue.
>
> Cheers,
>
> mike
>

> [1]http://stackoverflow.com/questions/2743521/how-to-change-user-agent-o...

> [2]http://code.google.com/p/googleappengine/issues/detail?id=342
>
>
>
>
>
>
>
> On Mon, Nov 14, 2011 at 4:47 PM, Mike Ossareh <ossa...@twitch.tv> wrote:
> > Hi Esoma,
>
> > If you give us the full request, headers and all then we'll be able to
> > help debug this. As far as we know there is no reason for GAE to not work,
> > but it could be something subtle like a header being set that we disagree
> > with. So, yeah, provide us as much info as you can and we'll do our best to
> > help you out.
>
> > Cheers,
>
> > mike
>

> > On Mon, Nov 14, 2011 at 2:21 PM, esoma <stillusing...@gmail.com> wrote:
>
> >>http://api.justin.tv/api/stream/list.json?channel=channelName1,channe....
> >> ..

[Mike Ossareh]

Hey,

Yeah, you've identified that correctly. We've looked at our nginx configs and do not see anything on our side that would cause this.

We'll dig some more though.