Alter Headers

An example for adding, modifying, or removing headers that are sent in a request or returned in a response.

addEventListener("fetch", (event) => {
    event.respondWith(handleRequest(event.request));
});

async function handleRequest(request) {
  const response = await fetch("https://example.com");

  // Clone the response so that it's no longer immutable
  const newResponse = new Response(response.body, response);

  // Add a custom header with a value
  newResponse.headers.append(
    "x-workers-hello",
    "Hello from Arvancloud Edge Computing"
  );

  // Delete headers
  newResponse.headers.delete("x-header-to-delete");
  newResponse.headers.delete("x-header2-to-delete");

  // Adjust the value for an existing header
  newResponse.headers.set("x-header-to-change", "NewValue");

  return newResponse;
}