[http] gPXE is a HTTP/1.0 client, not a HTTP/1.1 client

gPXE is not compliant with the HTTP/1.1 specification (RFC 2616),
since it lacks support for "Transfer-Encoding: chunked".  gPXE is,
however, compliant with the HTTP/1.0 specification (RFC 1945), which
does not require "Transfer-Encoding: chunked" to be supported.

The only HTTP/1.1 feature that gPXE uses is the "Host:" header, but
servers universally accept that one from HTTP/1.0 clients as an
optional extension (it is obligatory for HTTP/1.1).  gPXE does not,
for example, appear to support connection caching.  Advertising as a
HTTP/1.0 client will typically make the server close the connection
immediately upon sending the last data, which is actually beneficial
if we aren't going to keep the connection alive anyway.

diff --git a/src/net/tcp/http.c b/src/net/tcp/http.c
index db92e9ebae97176029e8ee27488da41704e5763c..4dc1ab73aacae62bdb3410f58b9120587e7e0fc2 100644 (file)
--- a/src/net/tcp/http.c
+++ b/src/net/tcp/http.c
@@ -393,7 +393,7 @@ static void http_step ( struct process *process ) {
        if ( xfer_window ( &http->socket ) ) {
                process_del ( &http->process );
                if ( ( rc = xfer_printf ( &http->socket,
-                                         "GET %s%s%s HTTP/1.1\r\n"
+                                         "GET %s%s%s HTTP/1.0\r\n"
                                          "User-Agent: gPXE/" VERSION "\r\n"
                                          "Host: %s\r\n"
                                          "\r\n",