How to read Headers in Spring Boot Controller How to Allow Custom Headers in Spring Boot Suppose we have a controller and want to bind the Headers to a variable, then we can do the following @RequestHeader(value = "Accept-Language", defaultValue = "en") String locale This will bind the Header Accept-Language , to the variable locale. value="" It defines the name of the header to bind to the variable required= boolean It tells if this is mandatory header or not. default value is true defaultValue ="" It can be used to give a default value if the header is not present. Similarly you can bind Custom Headers like shown below // String @RequestHeader(value = "X-My-String-Header", defaultValue = "Hello World") String h1 // Long @RequestHeader(value = "X-My-Long-Header", defaultValue = 212) Long h2 Do not use " _ " underscore in header key or values, because they get neglected while htt...