How Fiddler works

Personal understanding ：fiddler It's a bag grabbing tool , When the browser accesses the server, it will form a request , here ,fiddler Between requests , When the browser sends a request, it will go through fiddler, Then go to the server , When the server has data to return to the browser, it will also go through fiddler, Then the data will be displayed in the browser , Such a process ,fiddler You've caught the whole process of requesting and responding to data .

fiddler Exit the process correctly ：

fiddler Interface ：

fiddler Grab and parse

1. Left panel

Capture tool panel function

http Resquest The order , from 1 Start , Incrementing in the order of page load requests

result：http Status of the request response

protocol： The protocol requested to be used （http or https）

host： The domain name of the requested address

url： Path and file name of the requested server , Also contains get Parameters

body： Requested size , With byte In units of

content-type： The type of request response

caching： The requested cache expiration time or cache control header value

process： The person who made this request windows Process and process id

comments： The user gives this through script or menu session Added remarks

customs： User defined values that can be set by script

2. Right panel

 statistics Statistics tab

Through this tab , Users can select multiple sessions to get the total information statistics of these sessions , For example, the number of bytes of multiple requests and transfers , Select the first request and the last request , Get the total time spent loading the entire page , From the bar chart, you can also see which ones take the most time , So as to optimize the access speed of the page

inspectors Check tab

It provides headers,textview,hexview,raw And so on http Requested request message information , It's divided into two parts , Upper display request , Lower display response

authoresponse Automatic response tab

It can grab online pages and save them locally for debugging , It greatly reduces the difficulty of online debugging , You can modify the data returned by the server

composer Build tab

Support manual build and send http,https and ftp request , We can also from web session Drag from the list session, Put it in composer Tab , When we click execute Button , Send the request to the server  

The operation is as follows ：

 

In this way, the request sent is not sent by the browser , Namely fiddler Emitted , see inspectors The information inside is OK

logs Log tab ： Print log

filters Filter tab

The filter can filter the request flow list on the left , We can mark , Change to hide some features of the data flow