bug#42382: 26.3; url-http handling of Location redirection headers containing whitespace

[Robert Pluim <rpluim@gmail.com>]

>>>>> On Wed, 15 Jul 2020 14:40:36 -0600, Daniele Nicolodi <daniele@grinta.net> said:

    Daniele> In RFC 7231 the Location header is defined to carry a URI-reference.
    Daniele> According to RFC 3986 it should be percent-encoded and thus should not
    Daniele> contain spaces. However, there are HTTP server implementation (notably
    Daniele> nginx) that do not do that. While this is a bug in those HTTP server
    Daniele> implementations, I think Emacs should follow what most other HTTP client
    Daniele> implementatios (all the ones I tested) and use the content of the
    Daniele> Location header unmodified. Stripping of angle bracket quotes is
    Daniele> unnecessary as they are not valid according to the RFCs.

Nor is embedded whitespace in the URI :-)

Are you sure this won't break anything? ie are you sure there are 0
server implementations out there that send angle brackets?

Iʼd be conservative, and just replace the truncation on whitespace
with percent-encoding of said whitespace.

    Daniele> Also, accordingly to the RFCs, the location header may contain a
    Daniele> relative location. Thus the comment that suggest that such a response is
    Daniele> a bug in the server should be reworded.

    Daniele> The attached patches implement the proposed changes.

The second patch is small enough that I think you can combine the two.

Robert