fix another typo

HTTP.cpp

@@ -71,11 +71,11 @@ namespace http {
   bool URL::parse(const std::string& url) {
     std::size_t pos_p = 0; /* < current parse position */
     std::size_t pos_c = 0; /* < work position */
-    if (url.at(0) == "/" && url.find("/http://") == 0) {
+    if (url.at(0) == '/' && url.find("/http://") == 0) {
       /* specical case */
       pos_p ++;
     }
-    if(url.at(0) != "/" || pos_p > 0) {
+    if(url.at(0) != '/' || pos_p > 0) {
       /* schema */
       pos_c = url.find("://");
       if (pos_c != std::string::npos) {