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Introduction to ETag

In web development,ETagETag (Entity Tag) is an HTTP header field used to identify a specific version of a resource. The main purpose of ETag is cache control and optimization. By comparing the ETag values ​​of client and server resources, it can be determined whether the resource has changed, thereby avoiding unnecessary data transmission. ETag is usually a string, which can be a hash value, version number or timestamp.

Springboot interface adds ETag

You can use the ShallowEtagHeaderFilter provided by Spring Boot to implement a simple ETag interface. Sometimes we need to set the ETag manually. It should be noted that the value of the ETag header must comply with the HTTP specification. Usually, the ETag value should be enclosed in double quotes, for example