When I tried i received a 200 status code and at html table response.
Not knowing the backend what the server did with the posted data I have no idea.
tried GET and it worked e.g.
[{"id":"6c55d18d.ea2fb","type":"http request","z":"5a245aa1.510164","name":"","method":"GET","ret":"txt","paytoqs":"query","url":"http://cwfun.org/cgi-bin/funspots.cgi","tls":"","persist":false,"proxy":"","authType":"","x":290,"y":2520,"wires":[["5718d21f.aeb06c"]]},{"id":"5718d21f.aeb06c","type":"debug","z":"5a245aa1.510164","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":480,"y":2520,"wires":[]},{"id":"626ab5fa.24dc24","type":"inject","z":"5a245aa1.510164","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"{\"dir\":\"moqp\",\"station\":\"WORKED\",\"frequency\":\"7000\",\"comment\":\"testing\",\"poster\":\"W1AW\",\"submit\":\"Post\"}","payloadType":"json","x":100,"y":2520,"wires":[["6c55d18d.ea2fb"]]}]
As you can see the top line says worked
Also PUT works and returns 302
eg.
[{"id":"626ab5fa.24dc24","type":"inject","z":"5a245aa1.510164","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"dir=moqp&station=W0MA&frequency=7000&comment=testing&poster=W1AW&submit=Post","payloadType":"str","x":100,"y":2520,"wires":[["6c55d18d.ea2fb"]]},{"id":"6c55d18d.ea2fb","type":"http request","z":"5a245aa1.510164","name":"","method":"PUT","ret":"txt","paytoqs":"query","url":"http://cwfun.org/cgi-bin/funspots.cgi","tls":"","persist":false,"proxy":"","authType":"","x":290,"y":2520,"wires":[["5718d21f.aeb06c"]]},{"id":"5718d21f.aeb06c","type":"debug","z":"5a245aa1.510164","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":480,"y":2520,"wires":[]}]