How to use mitmproxy to get data return in automated testing?

Background introduction

When we are at the interface or UI In automation projects , This phenomenon often occurs —— It's obviously a normal request , But can't get the desired data return .

such as ：

• scene A： Pages are dynamic data , The data obtained by entering the page for the first time , It is completely different from the data obtained next time you enter the page .

• scene B： Page data has display restrictions , Some modules of the page or the entire page data are only displayed 3 Time , And the server returns the control .

What should we do at this time ？

If it is a manual test , We can use it directly Charles、Fiddler To simulate , After all, agent software can basically solve most of the testing needs .

What if it's in an automation project ？ If you still use agent software —— In fact, it's not completely impossible , But we have better ways to practice .

That is to use MitmProxy Act as a forward proxy to intercept requests and return data .

How to use MitmProxy As a forward agent

Realization Maplocal

MitmProxy It's a tripartite library , We can regard it as Charles To use .

Here to achieve Maplocal Function description ：

（1）Maplocal function , The simple understanding is when specific requests , Return specific data .

For example, request "www.baidu.com", Normal should return to ：

But we modify the returned data , As long as there is "www.baidu.com" Please come here , Just let it return automatically ：

This is the most basic maplocal Case study .

（2） stay MitmProxy How to realize Maplocal What about function? ？

Here we use get Request the implementation to explain ：

get.json The configuration file , Record all that need to be intercepted here get request ：

MitmProxy Script ：

In the executed script （ Like local shell or Other implemented py Script ）：

After starting the script , Connect MitmProxy All requests from devices will be monitored by scripts .

If appear "www.baidu.com" Request , It will come to get.json Find the corresponding in json, Automatically return to the device .

such , It realizes the simplest maplocal.

Of course, based on the current MitmProxy Script , We can also expand some functions .

For example, for the interface type get or post request , For request parameter type json or x-www-form-urlencoded, Can be extended more .

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