How to use Fiddler for weak network testing

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test APP、web Weak network testing is often needed , That is, when the signal is poor 、 Test when the network is slow . We usually use mobile phones ourselves APP when , On the subway 、 The elevator 、 In garage and other scenes, we often encounter session interruption 、 Overtime, etc , This is a weak network .

Ordinary weak network testing can choose a third-party tool for bandwidth 、 Packet loss 、 Delay, etc. simulate the weak network environment .

Here we take you to unlock Fiddler Weak network simulation function ！

Operation steps

explain ： If you are an analog phone APP Weak network of , Then you need to make sure Fiddler Can catch the mobile phone APP My bag .

step 1： stay Fiddler Start the weak network

open Fiddler→Performance→ Check Simulate Modem Speed, After checking, you will find that the network speed has slowed down , Because there are preset network parameter values in the system .

step 2： Set network parameters

（1） open Fiddler→Customize Rules;

（2） Find the code outlined below , Set the weak network parameter value here .

analysis ： If m_SimulateModem by True, That is to say fiddler Open the weak network mode , So upload 1KB Content needs 300ms（ The upload speed after conversion is 1KB/0.3s=3.3KB/s）, download 1KB Content needs to be 150ms（ The download speed after conversion is 1KB/0.15s=6.6KB/s）.

If you want to simulate 2G The Internet , Upload and download configuration is as follows ：

oSession["request-trickle-delay"] = "3000";

oSession["response-trickle-delay"] = "1500";

If you want to simulate 3G The Internet , Upload and download configuration is as follows ：

oSession["request-trickle-delay"] = "20"  ;

oSession["response-trickle-delay"] = "10";

mobile phone APP Use SIM Card data flow , Consider different operators ： Unicom 、 Move 、 telecom , According to the uplink rate 、 Download rate to set parameters .

The formula is ：[1/( Up or down rate /8)] x 1000

Be careful ：1KB=8kb

（3） After setting up , preservation . At this time step 1 Checked Simulate Modem Speed Will be unchecked , You need to check it again before testing .

  remarks ：

General browser developer tools ( recommend Chrome） It has the function of simulating weak network .

Browser opens developer tools ( Shortcut key F12); choice Network bar , Select the network status according to the demand , Like online 、3G、2G、 Offline, etc .

Weak network test concerns

Weak network testing mainly focuses on when the network condition is bad , Response time of the application 、 Page rendering 、 Timeout prompt 、 Overtime reconnection, etc . We should pay special attention to the problem of data submission during the test , Generally, the front end will time out , Throw an exception prompt after how many seconds , At this time, the data should not be submitted successfully . The software I tested before has appeared , When the network is weak , Data can be submitted successfully many times .

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