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This article shows you how to deal with cross-domain requests through CORS in the implementation of route matching based on gorilla/mux packets. The content is concise and easy to understand, which will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

In SPA applications or other front-end separation applications, cross-domain requests may be involved if the front-and back-end domain names are not consistent.

Cross-domain requests and CORS have been briefly introduced in the previous tutorial on the use of Laravel CORS expansion packs. If you don't know anything, you can take a look at them. I won't repeat them here. The principle of Go language here is the same as there. In routers implemented based on gorilla/mux, in order to handle cross-domain requests through CORS, you can do this:

Set CORS related headers in your own CORS processor, such as Access-Control-Allow-Origin

Use CORSMethodMiddleware as a middleware to set the Access-Control-Allow-Methods response header to define the HTTP request method allowed by routing.

In order for the middleware to set the response header, ⚠️ must include the OPTIONS method in the request method matcher.

Let's look at a simple example:

Package main

Import ("net/http"github.com/gorilla/mux")

Func main () {r: = mux.NewRouter ()

/ / Note: in order for middleware to set the CORS header, the Methods method must include the OPTIONS method r.HandleFunc ("/ api/cors", corsHandler) .Methods (http.MethodGet, http.MethodPut, http.MethodOptions) / / CORSMethodMiddleware middleware sets the method set in the previous step to the Access-Control-Allow-Methods response header r.Use (mux.CORSMethodMiddleware (r)).

Http.ListenAndServe (": 8080", r)}

Func corsHandler (w http.ResponseWriter, r * http.Request) {w.Header () .Set ("Access-Control-Allow-Origin", "*") if r.Method = = http.MethodOptions {return}

W.Write ([] byte ("Cors Request"))}

Run this code to start the server, and then initiate a request for the / api/cors route with the following command:

Curl-v http://localhost:8080/api/cors

Using the-v option, you can see the request header and response header information, and the results are as follows:

You can see that Access-Control-Allow-Methods and Access-Control-Allow-Origin response headers are included in the response header, indicating the methods and domain names supported by cross-domain requests, respectively. If the front-end domain name is fontend.xueyuanjun.com and the back-end domain name is backend.xueyuanjun.com, they can now communicate based on Ajax requests.

The above content is based on gorilla/mux packet to achieve route matching, how to deal with cross-domain requests through CORS, have you learned the knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

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