If-Match header

The **If-Match header** is an HTTP request header used to make a request conditional based on the current state of a resource. It allows clients to perform operations like updates or deletions only if the resource’s entity tag (ETag) matches the value specified in the header. This helps prevent conflicts or accidental overwrites when multiple clients interact with the same resource. Commonly used in RESTful APIs and web applications, the If-Match header ensures data integrity and concurrency control by allowing safe conditional requests.