HTTP/1.1 409 Bad Helper Content-Type: text/html; charset=UTF-8 Cache-control: no-cache Connection: close Proxy-Connection: close
The helper key you put for i2paddresshelper= is not resolvable. It seems to be garbage data, or a mistyped b32. Check your URL to try and fix the helper key to be a valid Base 32 hostname or Base 64 key.