作为web开发，应该至少有一款使用顺手的http嗅探器，以备开发分析之用，加上ajax现在如此盛行，更加需要一个工具能分析在页面背后传输的http内容。找了几款http嗅探器，以备选用

1.Fiddler

Fiddler is a HTTP Debugging Proxy which logs all HTTP traffic between your computer and the Internet. Fiddler allows you to inspect all HTTP Traffic, set breakpoints, and "fiddle" with incoming or outgoing data. Fiddler includes a powerful event-based scripting subsystem, and can be extended using any .NET language.

Fiddler is freeware and can debug traffic from virtually any application, including Internet Explorer, Mozilla Firefox, Opera, and thousands more.

http://www.fiddlertool.com/fiddler/

文章推荐http://www.cnblogs.com/FrameWork/archive/2006/10/16/529835.html

2.ieHTTPHeader

以ie插件的形式能查看往返的HTTP Request/Response Header

3.HTTPLook

HTTPLook 是一个 HTTP 的嗅探器，它能捕捉本机与其它任何主机的 HTTP 通讯（不是 HTTPS 哦 ），然后显示详细的 HTTP 操作（如 GET/POST）、访问资源的 URL 、字节数大小等，这个软件简单易用，不用对 Internet Explorer 做任何其它设置（有的软件通过在 IE 中设置代理来监控数据），也不需要其它任何软件的支持，是一款较为绿色的、轻量级的软件。

4.httpExplorer

Used to examine unaltered http requests and responses intercepted with and without proxy. There are several views for the data. Raw view shows the data in bytes. Text view shows the headers in the request and response as well as the http payload. The list of requests and responses are also available in two different views. One view shows the summary of the request. The other view shows the actual sends and receives performed by the browser. It is possible to search through the request urls to look for a particular url using regular expression syntax. httpExplorer works by intercepting the client/server data stream of the embeded browser. It can also work in proxy mode where the data is intercepted by emulating a proxy server. 

5.IEWatch

IEWatch is a plug-in for Microsoft Internet Explorer that allows you to view and analyze HTTP/HTTPS headers. Furthermore you can view and analyze the HTML code directly in the browser window. 
Unlike proxy applications IEWatch integrates directly in Internet Explorer. No more complicated configuration settings are needed to view HTTP requests. No more searching through long lists of HTTP requests to find the information you are looking for. No more switching between windows to view the HTML source code. Intuitive and easy to use, IEWatch reveals the information you are searching for. View Cookies, GET and POST data by double clicking the list item. IEWatch lets you identify which requests take the longest to complete so you can tune the performance of your web site. Knowing that security is a concern, you can check if sensitive data is sent from your browser to the server. IEWatch is the ideal tool to learn how HTTP and HTML work. The comprehensive help file accelerates the learning curve 
IEWatch is the most essential tool for web developers and quality assurance engineers to get their job done fast and efficiently. 
For more information, visit http://www. iewatch. com. 

6.MMD HttpHeader

MMD HttpHeader is small, absolutely free tool designed to display http headers. Just 
type http address to get http header and connection timeout displayed in text window. 
It's perfect for all who learn http protocol, internet programers and testers and webmasters.

7.HttpWatch

强大的网页数据分析工具.集成在Internet Explorer工具栏.包括网页摘要.Cookies管理.缓存管理.消息头发送/接受.字符查询.POST 数据和目录管理功能.报告输出

http://down.zdnet.com.cn/detail/2/19336.shtml

8.Instance Source

http://www.skycn.com/soft/15582.html

9.Page Viewer(Maxthon2 插件) + firebug(firefox 插件)

这两款作为web开发辅助也是必不可少的

10.sniffer

sniffer pro，NAI公司出品的可能是目前最好的网络协议分析软件之一了，支持各种平台，性能优越，做为一名合格的网络管理员肯定需要有这么一套好的网络协议分析软件了