bug#32528: http-post breaks with XML response payload containing boundary

[Ricardo Wurmus <rekado@elephly.net>]

Hi Mark,

> Ricardo Wurmus <rekado@elephly.net> writes:
>
[…]
>> The reason why it fails is that Guile processes the response and treats
>> the *payload* contained in the XML response as HTTP.
>
> No, this was a good guess, but it's not actually the problem.

You are right.  I also ended up trying with “wget --save-headers” after
sending the bug report and noticed the offending header like you did:

>   Content-Type: multipart/related; type="text/xml"; start="<main_envelope>"; boundary="=-=-="
>
>   <?xml [...]

I assumed it was part of the payload when it really was a regular
header after all.

> The problem is simply that our Content-Type header parser is broken.
> It's very simplistic and merely splits the string wherever ';' is found,
> and then checks to make sure there's only one '=' in each parameter,
> without taking into account that quoted strings in the parameters might
> include those characters.

Right.  I worked around this in guile-debbugs simply by replacing the
Content-Type header parser with one that lacks the check for the unique
“=” in the string part.

> I'll work on a proper parser for Content-Type headers.

Thanks!

--
Ricardo