![]() When set to true, the server permits the inclusion of credentials in the requests. The allow credentials option in CORS configuration determines whether the server allows the inclusion of credentials, such as cookies or authorization headers, in CORS requests. Within this duration, subsequent requests to the same resource will not trigger another preflight request, reducing network overhead. By setting max age to 60, the browser will cache the preflight response for 60 seconds. By caching the preflight response, the browser can reuse it for a specified duration without sending additional preflight requests.Įxample: Let’s assume your API requires frequent requests from a frontend application, and you want to cache the preflight response for 60 seconds. It helps in reducing the number of preflight requests sent by the browser for subsequent requests to the same resource. The max age option sets the maximum time (in seconds) that the browser should cache the CORS preflight response. By setting allowed headers to "X-Auth-Token" and "Content-Type", the server allows these custom headers to be included in the CORS requests. You can specify multiple headers or use the wildcard “*” to allow any headers.Įxample: Suppose your API requires custom headers like “X-Auth-Token” and “Content-Type” for authentication and specifying the request’s content type. It defines which headers the server permits to be included in the requests. The allowed headers option specifies the headers that are allowed in CORS requests. For example, if you set allowed methods to "GET" and "POST", it means the server allows only GET and POST requests, and other methods like PUT, DELETE, etc., will be rejected. It defines which methods the server permits for accessing its resources. The allowed methods option specifies the HTTP methods that are allowed for CORS requests. By setting allowed origins to "", the server restricts CORS requests to only this specific domain, ensuring that requests from other domains are rejected. 2. You can either specify specific origins or use the wildcard “*” to allow requests from any origin.Įxample: Let’s say your frontend application is hosted at, and you want to allow only this domain to access your API. It defines which domains are permitted to make CORS requests to your server. The allowed origins option specifies the origins (domains) that are allowed to access the resources from your Spring Boot application. ![]() Let’s explore each of these options in detail and learn how they influence the behavior of your application’s CORS handling. Understanding the various CORS configuration options in Spring Boot enables fine-grained control over cross-origin resource sharing. Without the preflight request, a malicious website could potentially make cross-origin requests to sensitive resources without the user’s knowledge or consent. ![]() The preflight request is an important aspect of CORS because it allows servers to control which cross-origin requests are allowed, and provides a mechanism for browsers to enforce this policy. “Access-Control-Allow-Origin”, “Access-Control-Allow-Methods”, “Access-Control-Allow-Headers”), the browser will then send the actual XHR request with the desired HTTP method, headers, and payload. If the server responds with the appropriate CORS headers (e.g. The preflight request includes an “Access-Control-Request-Method” header that specifies the HTTP method of the actual request, and an “Access-Control-Request-Headers” header that lists the custom headers that the actual request may send. When an XHR request is made to a server with CORS enabled, the browser will first send a preflight request (also known as an “OPTIONS” request) to check if the server allows the specific HTTP method, headers, and other properties required for the actual request. An XHR request is considered a cross-origin request if it is made from a different domain, port, or protocol than the server hosting the API. This means that if your frontend application is running on a different domain or port than your Spring Boot backend application, you will need to explicitly allow CORS requests in your Spring Boot application.Ĭross-origin requests can be initiated by the XMLHttpRequest (XHR) API, which is commonly used by frontend frameworks like Angular, React, and Vue to make HTTP requests from the browser. By default, Spring Boot does not allow cross-origin resource sharing (CORS). ![]()
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