The HTTP 1.1 standard requires an Allow header for 405 Method Not Allowed:

  The response MUST include an Allow header containing a list of valid methods
  for the requested resource.

So provide such a header when we return a 405 to the user agent.

Signed-off-by: brian m. carlson <sand...@crustytoothpaste.net>
---
 http-backend.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/http-backend.c b/http-backend.c
index 0324417..8c464bd 100644
--- a/http-backend.c
+++ b/http-backend.c
@@ -594,9 +594,11 @@ int main(int argc, char **argv)
 
                        if (strcmp(method, c->method)) {
                                const char *proto = getenv("SERVER_PROTOCOL");
-                               if (proto && !strcmp(proto, "HTTP/1.1"))
+                               if (proto && !strcmp(proto, "HTTP/1.1")) {
                                        http_status(405, "Method Not Allowed");
-                               else
+                                       hdr_str("Allow", !strcmp(c->method, 
"GET") ?
+                                               "GET, HEAD" : c->method);
+                               } else
                                        http_status(400, "Bad Request");
                                hdr_nocache();
                                end_headers();
-- 
1.8.4.rc3

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