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Fiddler captures packets to simulate weak network environment testing

2022-07-31 01:49:00 【Love to eat caraway】

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现在的Android软件,Basically there will be network requests,有些APPWhen frequent data transmission is required, the stability of network requests and the compatibility under special network conditions are required,However, it is difficult for us to simulate the situation of weak network and poor network when we test,Today, I will share with you a dry article to simulate a weak network situation.

正文

第一步：下载抓包软件fiddler

官网：http://www.telerik.com/fiddler

这是PC端的软件,Our process for simulating a weak network environment is roughly：手机APPProxy to ours using a web proxypc上,Then all network requests go throughpc,这个时候我们就可以通过fiddlerto limit the network,So as to achieve the purpose of simulating a weak network environment.

这就是Fiddler的主界面了：

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第二步：设置fiddler

fiddlerAlso need to set up need to set up,Find the headTools功能,Then click on the first functionOptions,会弹出一个界面：

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找到Connections,把port改为8888,At this time, you can use our mobile phone proxy to the computer.

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第三步：Set up an Android device proxy

打开我们的手机,进入wifi设置,The thing to note here is that the Android device is connectedwifiMust be with oursPCIt is the same network to set up successfully.Available on most Android deviceswifiSet proxy in settings,However, it cannot be ruled out that a small number of devices are limited by the system.We need to know before setting up the proxyPC的ip地址,可以通过系统cmd命令,然后ipconfig获取,如下：

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Then you can set up a proxy on your phone,This is my phonewifiInterface for setting up the proxy：

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设置后之后,All network requests on the phone are proxied toFiddlerThen you can view it:

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第四步：Set network restrictions

回到我们的fiddler中来,在工具栏中找到Rules,From the name it is obvious what this function is for.再到Rules列表中找到Customize Rules,At this point, something similar to a text editor will pop up：

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used in this text editorCtrl+FUse the search function to search for keywords：simulate,The following code snippet can be found：

if (m_SimulateModem) {
    
    // Delay sends by 300ms per KB uploaded.
    oSession["request-trickle-delay"] = "300"; 
    // Delay receives by 150ms per KB downloaded.
    oSession["response-trickle-delay"] = "150"; 
}

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The rest of this code is left alone,你只需要知道request-trickle-delayIt represents the delay time of your network request,response-trickle-delayIt represents the delay time of network response,单位都是毫秒,It is given by default here300毫秒和150毫秒,所以,只需要修改这2This value can simulate network delay and weak network environment,For example, the above can be modified2个值为：2000和2000,Represents network request latency2秒,网络响应延迟2秒：

if (m_SimulateModem) {
    
    // Delay sends by 300ms per KB uploaded.
    oSession["request-trickle-delay"] = "2000"; 
    // Delay receives by 150ms per KB downloaded.
    oSession["response-trickle-delay"] = "2000"; 
}

Remember to press after making changesCtrl+S保存.

第五步：开启网络延迟

Then you can turn on the network delay,还是我们的Rules功能中,找到Performance,Then one can be seen in the sub-optionsSimulate Modems Speeds,选中它,大功告成,Network latency is turned on,Turn off network delay if needed,再次点击即可.

第六步：Expand weak network rules

Probably we don't want a consistently weak network environment in our testing,Rather, it is a randomly strong and weak network,This is more appropriate to our real situation,Then we can modify the above code as ：

static function randInt(min, max) {
    
    return Math.round(Math.random()*(max-min)+min);
}
if (m_SimulateModem) {
    
    // Delay sends by 300ms per KB uploaded.
    oSession["request-trickle-delay"] = ""+randInt(1,2000);
    // Delay receives by 150ms per KB downloaded.
    oSession["response-trickle-delay"] = ""+randInt(1,2000);
}