关于chrome.devtools.network API的困惑及请求头获取咨询

Hey there! I totally get where you're coming from—Firebug's XHR view was chef's kiss for quick scanning, and switching to Chrome DevTools (or the later Firebug iterations) just doesn't hit the same. Let's work through your extension-building questions:

1. Finding More Complete Official API Documentation #

I feel your pain with the sparse chrome.devtools.network page—coming from C++ docs, it's definitely a different vibe. The good news is Chrome's extension API docs are split across a few sections, and you're just looking at one small piece:

• The main Chrome Extensions DevTools API overview covers all related modules (not just network) like chrome.devtools.panels, chrome.devtools.inspectedWindow, and more. This is where you'll find the full context for how network APIs fit into the bigger extension ecosystem.
• For the Request and HAR object details you're missing, the docs defer to the HAR specification. While the blog you found isn't a formal W3C standard, it's maintained by the creator of the HAR format and is the de facto authoritative source for how these objects are structured. Chrome's implementation strictly follows this spec, so every field defined there maps directly to the objects you'll get in your extension.

2. Accessing Request Headers in Your Listener #

You're closer than you think! The request object passed to chrome.devtools.network.onRequestFinished.addListener follows the HAR 1.2 entry structure—so the actual request details (headers, body, etc.) are nested under its request property. That's probably where you got tripped up earlier.

Here's a quick code example to fetch headers:

chrome.devtools.network.onRequestFinished.addListener((request) => {
  // Access request headers from the nested request object
  const requestHeaders = request.request.headers;
  
  // Iterate through headers to log or process them
  requestHeaders.forEach(header => {
    console.log(`${header.name}: ${header.value}`);
  });

  // Access request body (if available)
  if (request.request.postData) {
    console.log(`Request Body: ${request.request.postData.text}`);
  }
});

If you need headers that aren't included in the initial HAR snapshot (like some security headers), you can use the asynchronous getHeaders() method to fetch the full set:

chrome.devtools.network.onRequestFinished.addListener(async (request) => {
  const fullHeaders = await request.getHeaders();
  console.log('Complete Request Headers:', fullHeaders);
});

内容的提问来源于stack exchange，提问作者Ruvi