GM.xmlHttpRequest

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Returns

undefined

As of version 0.8.5, an object with one method, abort().

Examples

Bare Minimum

GM_xmlhttpRequest({
  method: "GET",
  url: "http://www.example.com/",
  onload: function(response) {
    alert(response.responseText);
  }
});

GET request

GM_xmlhttpRequest({
  method: "GET",
  url: "http://www.example.net/",
  headers: {
    "User-Agent": "Mozilla/5.0",    // If not specified, navigator.userAgent will be used.
    "Accept": "text/xml"            // If not specified, browser defaults will be used.
  },
  onload: function(response) {
    // Inject responseXML into existing Object (only appropriate for XML content).
    if (!response.responseXML) {
      response.responseXML = new DOMParser()
        .parseFromString(response.responseText, "text/xml");
    }

    GM_log([
      response.status,
      response.statusText,
      response.readyState,
      response.responseHeaders,
      response.responseText,
      response.finalUrl,
      response.responseXML
    ].join("\n"));
  }
});

POST request

When making a POST request, most sites require the Content-Type header to be defined as such:

GM_xmlhttpRequest({
  method: "POST",
  url: "http://www.example.net/login",
  data: "username=johndoe&password=xyz123",
  headers: {
    "Content-Type": "application/x-www-form-urlencoded"
  },
  onload: function(response) {
    if (response.responseText.indexOf("Logged in as") > -1) {
      location.href = "http://www.example.net/dashboard";
    }
  }
});

HEAD request

As defined in HTTP, you may issue a HEAD request to get the response headers, without receiving the entire response body.

GM_xmlhttpRequest({
  url: "http://www.example.com",
  method: "HEAD",
  onload: function(response) {
    GM_log(response.responseHeaders);
  }
});

Notes

¹ Note that if the data field contains form-encoded data, you usually must also set the header 'Content-Type': 'application/x-www-form-urlencoded' in the headers field.

² Some headers may not actually work through GM_xmlhttpRequest. For example, the Referer header cannot be overriden. [1] [2]