Some libcurl clients send file:// URLs via configured proxy

[rjek]

Binary package hint: curl

In Ubuntu 10.04 (beta 1), if a proxy is configured, "use the same proxy for all protocols" is ticked, and the setting is applied system-wide, some libcurl clients end up sending file:// URLs via the configured proxy. The proxy then politely tells them where to shove their request.

Occurs in 7.19.7-1ubuntu1. (Test application is NetSurf, which has its own proxy settings, but is careful not to apply them when fetching file:// URLs; it would appear libcurl is setting it anyway.)

An strace of NetSurf shows this:
sendto(14, "GET file:////home/rjek/svn/netsurf/netsurf/gtk/res/gtkdefault.css HTTP/1.0\r\nUser-Agent: NetSurf/3.0 (Linux; x86_64)\r\nHost: \r\nAccept: */*\r\nAccept-Encoding: gzip\r\nProxy-Connection: Keep-Alive\r\n\r\n", 193, MSG_NOSIGNAL, NULL, 0) = 193