[Chicken-hackers] [PATCH] Fix how chicken-install handles server errors and add redirect support

[Peter Bex]

Hi all,

We noticed in yesterday's Salmonella run that chicken-install isn't
handling HTTP error codes correctly:

https://salmonella-freebsd-x86-64.call-cc.org/master/clang/freebsd/x86-64/2019/09/15/yesterday-diff/log2/install/zmq.html

As you can see, we get a compiler error on an HTML document which is
being processed as Scheme code.

After a quick look at egg-download.scm, it become clear that the handling
for error codes was wrapped only inside the code that handled 407 codes.
That code itself did not look correct either, because it would not read
the response line or headers after sending the new request through the
proxy.  The first patch fixes these issues.

While in there, I decided that adding support for redirects shouldn't
be too hard, so that's what the second patch does.

Cheers,
Peter

0001-Fix-egg-download-response-handling.patch
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0002-Handle-301-302-redirects-in-chicken-install.patch
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