How to solve the cross-domain problem of uniapp

With the rapid development of mobile Internet, mobile application development has become an essential skill for major enterprises and developers. Uniapp, as a mobile application development framework that is lightweight, flexible and has a short development cycle, has been favored by more and more developers.

However, there are also some problems in the use of Uniapp, one of the more common problems is the cross-domain problem. This article will introduce the causes of uniapp cross-domain problems and provide specific solutions.

1. Causes of uniapp cross-domain problems

Cross-domain means that when the browser sends a request to the server, if the protocol, host name or port of the current page is different from the server, it will Cross-domain issues arise. In web development, due to the existence of security policies, browsers are only allowed to make requests to the same-origin server. The same-origin server means that the protocol, host name, and port of the server are exactly the same as the current web page.

The Uniapp framework is encapsulated based on Vue.js, and Vue.js has its own cross-domain solution. However, since Uniapp is a cross-platform development framework, the Uniapp project has many special situations that may prevent Vue.js from fully covering the cross-domain solution.

2. Solution to the cross-domain problem of uniapp

1. Make cross-domain settings in the uni-config.json configuration file.

In the Uniapp framework, cross-domain settings can be set in the project's global configuration file uni-config.json. The specific method is to add the "request" field under the "networkTimeout" field in the file and configure a proxy address.

For example:

{
    "networkTimeout": {
        "request": 30000,
        "downloadFile": 10000,
        "uploadFile": 10000,
        "connectSocket": 5000,
        "uploadTask": 10000,
        "downloadTask": 10000
    },
    "proxy": {
        "/api": {
            "target": "https://www.example.com",
            "changeOrigin": true,
            "secure": false,
            "pathRewrite": {
                "^/api": ""
            }
        }
    }
}

In the above configuration, "/api" refers to the prefix of the proxy address, and "target" refers to the proxy address. The "changeOrigin" field is used to control whether the host in the request header uses the proxy address, the "secure" field is used to control whether the https protocol is used, and the "pathRewrite" field is used to control the path rewriting rules during proxying.

2. Add the ‘Access-Control-Allow-Origin’ field to the header of uni.request

The network request API that comes with the Uniapp framework is uni.request. Cross-domain issues can be solved by setting its request header information. The specific method is to add the "Access-Control-Allow-Origin" field to the request header information.

For example:

uni.request({
    url: 'https://www.example.com/getdata',
    method: 'GET',
    header: {
        'content-type': 'application/json',
        'Access-Control-Allow-Origin': '*'
    },
    success: (res) => {
        console.log(res);
    },
    fail: (err) => {
        console.log(err);
    }
});

In the above code, the value of the "Access-Control-Allow-Origin" field is "", which means that all domain names are allowed to access the interface. If you want to specify a specific domain name for access, you need to replace "" with the specific domain name.

3. Summary

The above is the solution to the uniapp cross-domain problem. If you encounter cross-domain problems, you can try to solve them by configuring the proxy address in the configuration file or setting specific fields in the header. These methods are proposed based on the particularity of the Uniapp framework and can effectively solve cross-domain problems in the Uniapp project.

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