2.1.1 Section 5.2, Access-Control-Allow-Credentials Response Header

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The specification states:

 The Access-Control-Allow-Credentials header indicates whether the response to request can be exposed when the omit credentials flag is unset. When part of the response to a preflight request it indicates that the actual request can include user credentials. ABNF:
  
 Access-Control-Allow-Credentials: "Access-Control-Allow-Credentials" ":" true
                             true: %x74.72.75.65 ; "true", case-sensitive

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