Fiddler
- in the client and server-side HTTP proxy
Agent: All client requests go through fiddler, and then forwarded to the appropriate server
The server will go through all the appropriate fiddler, and then sent to the client
1. Common HTTP packet capture tool: fiddler, charles
2. Functions
Record all HTTP requests between client and server, a request for a particular, data analysis request, set a breakpoint, debug web application, to modify the request data, the server returns the modified data
3. Use
The default monitor 127.0.0.1:8888
1) Firefox proxy server settings
2) access to the target site
When forced F5 to refresh the page, the request again
3) request for session recording is displayed in the request panel
Session-- on behalf of a browser session
Common requests resources:
Common response results:
200: The server responds successfully
202: The server has accepted the request, but has not yet processed
302: Redirect, Temporary Mobile
401: Illegal Request parameter (distal bug)
404: resources on the server could not find the requested
405: request method is not allowed (does not support post, get, etc.)
500: Internal server error occurred, the request method does not allow (the back-end code throws an exception)
503: The service did not start the server timed out
Common HTTP status codes: http: //blog.sina.com.cn/s/blog_69081e0601013dj8.html
filter:
1) set a specific domain name
HTTP request to the site to record the specified domain name, domain name filtering other requests
2) Set the process of requesting
3) Set the regular expression to the request header
Record the regular expression of that part of the request
4) The state of blocking request http
5) Set a request type and size
6) Set response header
Statistic data statistics unit
Basic Performance Data: DNS resolution time, establish TCP / IP connection time consumption
Inspectors viewer
Incoming response parameters and results
Composer Designer
Raw the copy request information, into the head Composer, the request parameter in the Request Body
Click on 
request
Body Change Request parameter values in the request, responds to changes result
AutoResponder自动回复器
Fiddler可用于拦截某一请求，并重定向到本地资源。
生成环境服务器上某个css/JavaScript文件有问题需要修改时，通常需要修改文件、重新发布再验证，易影响到生产环境的稳定性。又或者在开发环境中修改文件并验证，然后发布到生产环境，安全却繁琐。
利用Fiddler可修改HTTP数据的特性，可以敏捷的基于生产环境修改并验证，确认后发布。
尽量在真实环境下调试，可最大限度的减少bug发生的可能性。
使用：
1） 将请求文件保存在本地
2）选择AutoResponder，Add Rule，重定向到本地文件
此时再发出请求，请求的是本地资源
断点调试
Before Request：发送请求后，fiddler代理中转之前，此时可以修改请求的数据
设置断点：bpu xxx（对url中包含了xxx的请求设置断点，请求在到达服务器前被中断）
再次发出请求，登录无响应
取消断点：bpu（无携带参数）
再次发出请求，登录正常响应
After Request：服务器响应之后，在fiddler将响应中转给客户端之前，此时可以修改响应断点结果
设置断点：bpafter xxx（对url中包含了xxx的请求设置断点，响应在到达客户端前被中断）
取消断点：bpafter（无携带参数）
Fiddler常用命令
Select xx：筛选出请求类型
如：select image 筛选出所有图片请求
?text：匹配出所有url中包含text的请求
>size、<size：选择响应大小符合size条件的请求
=status：选择响应状态等于给定状态status的所有请求
@host：选择包含指定host的全部请求
分析测试中的bug：
若未抓到请求：先查看过滤器的设置，若设置没问题，则可能是前台未发起后台的请求
若有正常提交的请求，查看请求的响应状态码（404，405，401，500等）
具体使用_参考地址：http://www.cnblogs.com/ink-marks/p/6363275.html