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HTTP

  • In case of Ajax request 'X-Requested-With' headers added. This type of request not something from browser typed.

  • Response is ok if HTTP status code between 200-299 and if cached status code 304.

  • The Host is the domain the request is being sent to. This header was introduced so hosting sites could include multiple domains on a single IP.

  • The Origin header is the domain the request originates from.

  • The Host header is always included. The Origin header is included sometimes: It is always included on cross-origin requests (across all browsers), and in Chrome/Safari, it is also included on same-origin PUT/POST/DELETE requests. Same-origin GET requests do not include an Origin header.

  • CORS (Cross-Origin Resource Sharing) is a system, consisting of transmitting HTTP headers, that determines whether browsers block frontend JavaScript code from accessing responses for cross-origin requests. CORS is a part of HTTP that lets servers specify what hosts are permitted to load content from that server.

  • Access-Control-Allow-Origin: origin-site CORS response header. The resource determines in response if it can be viewed. Response.set_header("Access-Control-Allow-Origin", "https://yorsite.com")

  • The default behavior of cross-origin resource requests is for requests to be passed without credentials like cookies and the Authorization header.

  • The cross-domain server can permit reading of the response when credentials are passed to it by setting the CORS Access-Control-Allow-Credentials header to true.

  • Some web servers dynamically create Access-Control-Allow-Origin headers based upon the client-specified origin. This is a workaround for CORS constraints that is not secure.

  • Testing CORS. Run a server. Access from the devtool console while on different server.

  • Preflight options request.

  • Use a proxy to set appropiate headers to access content. https://cors-anywhere.herokuapp.com

  • Use of JSONP. Which loads by passing callback.

References