don't assume method name is always uppercase

Author: Liu Dongmiao

src/ngx_http_modsecurity_rewrite.c

@@ -146,12 +146,13 @@ ngx_http_modsecurity_rewrite_handler(ngx_http_request_t *r)
         const char *n_method = ngx_str_to_char(r->request_line, r->pool);
         if (n_method != NULL && n_method != (char *)-1) {
             char *p = (char *) n_method;
-            while (*p >= 'A' && *p <= 'Z') {
+            while (*p) {
+                if (*p == ' ') {
+                    *p = '\0';
+                    break;
+                }
                 p++;
             }
-            if (*p) {
-                *p = '\0';
-            }
         }
         if (n_uri == (char*)-1 || n_method == (char*)-1) {
             return NGX_HTTP_INTERNAL_SERVER_ERROR;