readFields falls back to r.Form, which includes the query string, so POST /backend-link/show?code=... and /confirm?code=... worked and put the code into access logs. Both routes now read the code from the body only (JSON or a form body).
readFields falls back to r.Form, which includes the query string, so POST /backend-link/show?code=... and /confirm?code=... worked and put the code into access logs. Both routes now read the code from the body only (JSON or a form body).