GM_xmlhttpRequest Data Attribute Not Functioning Properly

I'm currently utilizing a grease monkey script to send a GM_xmlhttpRequest to my locally hosted asp.net web service. However, I've encountered an issue with the data attribute not functioning properly. Despite checking the Github repository, I have found no mention of this problem.

Although some StackOverflow posts suggest that adding a Content-Type may resolve the issue, it has not worked for me personally.

Below is my GM_xmlHttpRequest code snippet:

(function() {
  console.log("Start Of Request");
  GM_xmlhttpRequest({
  method: "GET",
  url: "http://localhost:8807/api/justSayHello",
  data: "input=hello",
  headers: {
    "Content-Type": "application/x-www-form-urlencoded"
  },
  onload: function(response) {
    alert(response.responseText);
  },
   onerror:    function(reponse) {
       console.log("error: ", reponse);
   }
  });
    console.log("End Of Request");
})()

And here is the corresponding web service implementation:

[HttpGet]
public JsonResult justSayHello(string input)
{
    if (input == null)
    {
        return Json("Did you just speak?", JsonRequestBehavior.AllowGet);
    }
    if (input.Equals("hello"))
    {
        return Json("hello back!", JsonRequestBehavior.AllowGet);
    }
         return  Json("eh? Did you say something?", JsonRequestBehavior.AllowGet);
}

The current result displayed is "Did you just speak?" whereas I would expect it to return "hello".

A potential workaround

If I simply append the query string at the end, everything works smoothly. However, I prefer utilizing the provided data attribute.

"http://localhost:8807/api/justSayHello?input=hello"

Answer №1

Finally got it sorted out! Turns out the data attribute is only effective for post requests, while get requests pull information from the query string.

Switched to a post request and now everything is functioning flawlessly.

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