provider/fastly: Add support for Request Headers

[catsby]

Request Headers let you conditionally manipulate the Headers for various types of requests from users, backends, and Fastly's caches. Here we add header to the config, and allow users to specify headers to manipulate and how.

Example header block that delete the http.x-amz-request-id header that comes from a request served by AWS S3:

  header {
    destination = "http.x-amz-request-id"
    type        = "cache"
    action      = "delete"
    name        = "remove x-amz-request-id"
  }

Reference:

• Fastly docs on Adding or modifying headers on HTTP requests and responses
• Fastly API docs - https://docs.fastly.com/api/config#header

[phinze]

Good note here! I think there are other APIs where we (still) have race conditions because of this behavior. Nice to have it explained out front here.

[phinze]

Solid. LGTM!

[ghost]

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