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Handling HTTP "Upgrade" requests

From: David Thompson
Subject: Handling HTTP "Upgrade" requests
Date: Sat, 21 Feb 2015 18:00:03 -0500
User-agent: Notmuch/0.18.2 ( Emacs/24.4.1 (x86_64-pc-linux-gnu)

I've been tinkering with adding WebSockets[0] support to Guile's HTTP
arsenal.  The first blocking issue I've come across is that an HTTP
server must be able to detect the "Upgrade" header[1] and change
protocols.  In my case, once a client thread accepts a WebSocket
connection, it should speak the WebSocket protocol, not HTTP.

Here's an example of a backtrace that you'd see after a successful
WebSocket handshake, when the client tries to actually make use of the

    In ice-9/boot-9.scm:
       171:12  3 (with-throw-handler #t #<procedure 1720560 at web/...> #)
    In web/server/http.scm:
       126:17  2 (#<procedure 1720560 at web/server/http.scm:125:15 ()>)
    In web/request.scm:
       204:31  1 (read-request #<closed: file 0> ())
    In ice-9/boot-9.scm:
       106:20  0 (#<procedure 10ce380 at ice-9/boot-9.scm:97:6 (thr...> ...)
    ERROR: Bad request: Bad Request-Line: "\x81\x86B\x93�Q"

Does anyone have an idea about how to approach this problem?

Thanks in advance!


David Thompson
Web Developer - Free Software Foundation -
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