Merge branch 'jk/http-auth-redirects'

Handle the case where http transport gets redirected during the
authorization request better.

* jk/http-auth-redirects:
  http.c: Spell the null pointer as NULL
  remote-curl: rewrite base url from info/refs redirects
  remote-curl: store url as a strbuf
  remote-curl: make refs_url a strbuf
  http: update base URLs when we see redirects
  http: provide effective url to callers
  http: hoist credential request out of handle_curl_result
  http: refactor options to http_get_*
  http_request: factor out curlinfo_strbuf
  http_get_file: style fixes

t/lib-httpd.sh

@@ -204,7 +204,8 @@ set_askpass() {
 }
 
 expect_askpass() {
-	dest=$HTTPD_DEST
+	dest=$HTTPD_DEST${3+/$3}
+
 	{
 		case "$1" in
 		none)