Now I have tested with my appspot.com subdomain, and it works fine
with posting > 1MB data. So I agree, it must be a ghs.google.com
issue.

- Martin

ksjun wrote:
> <form action="/" method="POST" enctype="multipart/form-data">
>       <input type="file" name="file"><input type="submit"
> value="Upload">
> </form>
>
>
> With following conditions, a connection is closed immediately and 400
> error is occured. An application can't receive this request at all.
>
>  - The application has a custom domain like http://www.example.com
>  - A large file over than 1MB is submitted using a form POST.
>
> I tested several AppEngine applications that has own domain and every
> application shows same error.
>
> If I test on http://app-id.appspot.com or smaller than 1MB, I can
> upload a large file without a error.
>
> I suspect that 'ghs.google.com' drops a large file before the
> AppEngine servers. The 'ghs.google.com' is a CNAME for the custom
> domain of AppEngine.
>
> Is this a known behavior?
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