When basic is the only auth wanted (which it is by default), the auth phase

is always considered done immediately as Basic needs to extra passes.

This fix corrects bug report #848371.

lib/http.c

@@ -227,13 +227,15 @@ CURLcode http_auth_headers(struct connectdata *conn,
       }
       else
 #endif
-      if((data->state.authwant == CURLAUTH_BASIC) && /* Basic */
-         conn->bits.proxy_user_passwd &&
-         !checkheaders(data, "Proxy-authorization:")) {
-        auth=(char *)"Basic";
-        result = Curl_output_basic_proxy(conn);
-        if(result)
-          return result;
+      if(data->state.authwant == CURLAUTH_BASIC) {
+        /* Basic */
+        if(conn->bits.proxy_user_passwd &&
+           !checkheaders(data, "Proxy-authorization:")) {
+          auth=(char *)"Basic";
+          result = Curl_output_basic_proxy(conn);
+          if(result)
+            return result;
+        }
         *ready = TRUE;
         /* Switch to web authentication after proxy authentication is done */
         Curl_http_auth_stage(data, 401);
@@ -276,13 +278,15 @@ CURLcode http_auth_headers(struct connectdata *conn,
             return result;
           *ready = TRUE;
         }
-        else if((data->state.authwant == CURLAUTH_BASIC) && /* Basic */
-                conn->bits.user_passwd &&
-                !checkheaders(data, "Authorization:")) {
-          auth=(char *)"Basic";
-          result = Curl_output_basic(conn);
-          if(result)
-            return result;
+        else if(data->state.authwant == CURLAUTH_BASIC) {/* Basic */
+          if(conn->bits.user_passwd &&
+             !checkheaders(data, "Authorization:")) {
+            auth=(char *)"Basic";
+            result = Curl_output_basic(conn);
+            if(result)
+              return result;
+          }
+          /* basic is always ready */
           *ready = TRUE;
         }
       }