Fix multiple slashes

FossilOrigin-Name: b30d5f0a62a6fded32d2946b44e5be2340c56254964f5a69493397e145110de6

src/http/request.cpp

@@ -103,7 +103,7 @@ bool Request::try_strip_slash()
     if (url.length() == 0 || url == "/") return false;
     bool ret = false;
     // While loop because the user can just pass /url///////////...
-    while (url.back() == '/')
+    while (url.back() == '/' && url.length() != 1)
     {
         url.pop_back();
         ret = true;