How Can You Access HTTP Response Bodies in Chrome Extensions?

How to Decipher HTTP Response Bodies in Chrome Extensions

In browser development, accessing HTTP response bodies can pose a challenge, particularly when working within Chrome extension background scripts. While it's possible to access the HTTP request body using the 'chrome.webRequest.onBeforeRequest' event, retrieving the response body requires a more intricate approach.

One potential solution, as mentioned in the referenced Stack Overflow thread "Chrome extension to read HTTP response," involves utilizing the 'chrome.devtools.network' API. By attaching a debugger to the current tab and enabling Network within the debugger, it becomes possible to listen for the "Network.responseReceived" event. When this event is triggered, you can use the 'chrome.debugger.sendCommand' method to retrieve the response body for a specific request ID.

Here's an example snippet demonstrating this approach:

<code class="javascript">var currentTab;
var version = "1.0";

chrome.tabs.query(
  {
    currentWindow: true,
    active: true
  },
  function(tabArray) {
    currentTab = tabArray[0];
    chrome.debugger.attach({
      tabId: currentTab.id
    }, version, onAttach.bind(null, currentTab.id));
  }
);

function onAttach(tabId) {
  chrome.debugger.sendCommand({
    tabId: tabId
  }, "Network.enable");

  chrome.debugger.onEvent.addListener(allEventHandler);
}

function allEventHandler(debuggeeId, message, params) {
  if (currentTab.id != debuggeeId.tabId) {
    return;
  }

  if (message == "Network.responseReceived") {
    chrome.debugger.sendCommand({
      tabId: debuggeeId.tabId
    }, "Network.getResponseBody", {
      "requestId": params.requestId
    }, function(response) {
      // You get the response body here!
      // You can close the debugger tips by:
      chrome.debugger.detach(debuggeeId);
    });
  }
}</code>

This method is fairly comprehensive, offering access to both the response headers and the response body itself. However, it does involve creating a debugger session and attaching it to the current tab, which may introduce additional complexity or performance considerations.

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