Chrome开发者工具里的一个隐藏技能:chrome://net-internals
During my holiday I was writing a small tool for fun, which extracts my personal posts from http://www.baidu.com for further analysis.I am using AJAX in jQuery to perform a synchronous call to fetch html source code of given url specified by argument requestURL.、 function getPostByAJAX(requestURL){ var html = $.ajax({ url: requestURL, async: false}).responseText; return html; } The requestURL I am using is http://tieba.baidu.com/i/i/my_tie However when I try to access it via my JavaScript code above, it failed.And Chrome development tool didn’t give me enough information for trouble shooting. How to deal with this issue then? Then I found the useful tool from Google: chrome://net-internalsNow let’s continue to trouble shoot with this tool. (1) type chrome://net-internals in Chrome address bar, press enter key.Then click Event hyperlink. (2) Go to my own html page which will send AJAX request via jQuery, click F5 to send a new request, then go back to Chrome tool.Now I have found the trace entry for the sent request.Here below is the request detail which contains much more information compared with the one in Chrome development Tool-Network tab. And here below are response header fields: The return code 302 and location “http://static.tieba.baidu.com/tb/error.html?ErrType=1” give me a reminder that this issue might be related to logon state of BAIDU website, since I would like to return my personal information, it makes sense that the url can only return personal data if cookie is available or user credential is specified ( not supported by BAIDU in this case ).In order to verify my assumption, I request the url directly in Chrome and check its request header fields this time, and yes, the cookie field is there: So now the question is, how to send my cookie information together with the AJAX call in JavaScript code?I found this article from Google.According to the article, I add the following code in my function: And it works now: By the way, via this tool I can also figure out how the jQuery library file jquery1.7.1.js stored in local laptop is loaded by Chrome.Chrome reads this file by chunks with size 32768 ( the file consists of 8 chunks ). The total size 251661 matches exactly with the number I see in windows, perfect isn’t it? Further reading For more tips I gained during my daily work about Chrome development tools, please refer to this blog Chrome Development Tool tips used in my daily work. 本文来自云栖社区合作伙伴“汪子熙”，了解相关信息可以关注微信公众号"汪子熙"。
