I have been running into this error for the last 3 or 4 weeks making requests to app engine. Certain requests - especially HTTP DELETE requests, are having this error returned from the google server.
Others have reported the same error - with 3 outcomes I can locate
- It is caused by stale cookies - clear your cookies and it runs fine gmail help -
- It is caused by a malformed url - only cases I can find relate to urlfetch() - spaces in the url - App engine Group #1, App Engine Group #2
- No resolution - sporadic behaiour, IE only. App Engine Group #3, App Engine Group #4
I'm now getting this behaviour all the time, in every browser. I can completely clear down the cache/cookies etc. in Chrome, Firefox, Safari, restart the browser and still reliably get this error on the same requests, so I don't think its cookie related. In any case I can issue GET, POST & PUT requests no problem with the same cookie.
Given that it occurs reliably on specific DELETE requests, the malformed URL would seem the most likely, however my URL is really very simple, and works fine on the dev server
Firebug shows the request headers as (I've munged the keys as they contain identifying data, but did so by removing characters from the centre of the key - not either end to guarantee I didn't inadvert