How to solve cross-domain problems

How to solve cross-domain problems? Configure the CORS header in Nginx. The CORS standard allows sharing resources between different sources, including: domains that allow cross-domain requests: Access-Control-Allow-Origin methods that allow cross-domain requests: Access-Control-Allow-Methods header fields that allow cross-domain requests: Access-Control-Allow-Headers allow carrying credentials: Access-Control-Allow-Credentials Pre-flight request validity period: Access-Control-Max-Age

How to solve cross-domain problems using nginx

Cross-domain is a browser security mechanism that cross-domain problems occur when a web application requests resources from a different domain than its own source domain. By default, browsers block cross-domain requests to protect users from malicious activities such as cross-site scripting attacks.

CORS: Standards for solving cross-domain problems

The standard way to solve cross-domain problems is to use cross-domain resource sharing (CORS). CORS is a set of HTTP headers that allow sharing of resources between different sources.

Configuring CORS using nginx

You can use the add_header directive in nginx to configure CORS:

 <code>server { # ... # 允许跨域请求add_header 'Access-Control-Allow-Origin' '*'; # 允许跨域请求的方法add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS'; # 允许跨域请求的头字段add_header 'Access-Control-Allow-Headers' 'Content-Type, Authorization'; # 允许在预检请求中携带凭据（例如，cookie） add_header 'Access-Control-Allow-Credentials' 'true'; # 预检请求的有效期（以秒为单位） add_header 'Access-Control-Max-Age' '3600'; # ... }</code>

Configuration details:

• Access-Control-Allow-Origin : Specifies the domain that allows cross-domain requests. * means that all domains are allowed.
• Access-Control-Allow-Methods : Specifies a method that allows cross-domain requests.
• Access-Control-Allow-Headers : Specifies the header field that allows cross-domain requests.
• Access-Control-Allow-Credentials : Specifies whether cross-domain requests are allowed to carry credentials.
• Access-Control-Max-Age : Specifies the validity period of the preflight request.

HTTP Preflight Request

For some requests (for example, with a custom HTTP header field or a request using a non-simple method), the browser first sends a preflight request to check if the server allows the cross-domain request. If the server responds to a preflight request containing the appropriate CORS header, the browser will allow the actual cross-domain request.

By configuring the CORS header for nginx, cross-domain requests can be allowed and cross-domain issues can be resolved, ensuring that web applications can communicate between different sources.

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