After September 30, HTTP(S) Load Balancers will convert HTTP/1.1 header names to lowercase in the request and response directions; header values will not be affected.
As header names are case-insensitive, this change will not affect clients and servers that follow the HTTP/1.1 specification (including all popular web browsers and open source servers). Similarly, as HTTP/2 and QUIC protocols already require lowercase header names, traffic arriving at load balancers over these protocols will not be affected. However, we recommend testing projects that use custom clients or servers prior to the rollout to ensure minimal impact.
However I do not understand if this will affect headers injected by google, like "HTTP_X_APPENGINE_COUNTRY" which we use on our project, is this going to change or will it remain unaffected?
Hi Santiago,
Headers injected by Google will be lower case as "Load Balancers will convert HTTP/1.1 header names to lowercase in the request and response directions".
From the browser’s point of view it would not matter as browsers don’t look at the field name to see if they are upper or lower case.
That being said if your application is somehow manipulating or using that value please keep in mind that it would be good practice to have the application handle them as case insensitive.
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