Wechat applet - network data request

Learning notes

Alicloud disk : https://www.aliyundrive.com/s/5Zrfw9EpKwa
Extraction code :37sc

Network data request

Restrictions on network data requests in applets

In consideration of safety , The applet official makes the following two restrictions on the request of data interface ：

1. Only request https Interface of type
2. The domain name of the interface must be added to the trust list
   

To configure request Legitimate domain name

Requirements describe ： Suppose in your own wechat applet , Hope request https://www.escook.cn/ Interface under domain name
Configuration steps ： Log in to wechat applet management background -> Development -> Development and setup -> Server domain name -> modify request Legitimate domain name

matters needing attention :

1. Domain name only supports https agreement
2. Domain name cannot be used ip Address or localhost
3. The domain name must go through icp Keep on record
4. The server domain name can be applied for at most within one month 5 Time modification

launch get request

Call the information provided by wechat applet wx.request() Method , Can initiate GET Data request , The sample code is as follows ：

launch post request

Call the information provided by wechat applet wx.request() Method , Can initiate POST Data request , The sample code is as follows ：

Request data when the page is loaded

In many cases , We need to load the page at the beginning , Automatically request some initialization data . At this time, you need to enter the... On the page onLoad Calling function to get data in event , The sample code is as follows ：

skip request Legal domain name verification

If the back-end programmer Only... Is provided http Interface to protocol 、 Not available for the time being https Interface to protocol . At this time, in order not to delay the progress of development , We can use wechat developer tools , Temporarily open 「 The development environment does not verify the requested domain name 、TLS Version and HTTPS certificate 」 Options , skip request Verification of legal domain name .

Be careful ： skip request Options for legal domain name verification , Use only during the development and commissioning phase ！

About Cross domain and Ajax Explanation

Cross-domain problem Is only found in browser-based Web In development . because The host environment of the applet Not a browser , It is Wechat client , therefore There is no cross domain problem in applets .

Ajax The core of the technology is to rely on... In the browser XMLHttpRequest This object , because The hosting environment of the applet is wechat client , So in the applet It can't be called “ launch Ajax request ”, It is called “ Initiate a network data request ”.