2.1.5 Section 5.6, Access-Control-Allow-Headers Response Header

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V0005

The specification states:

 The Access-Control-Allow-Headers header indicates, as part of the response to a preflight request, which header field names can be used during the actual request. ABNF:
  
 Access-Control-Allow-Headers: "Access-Control-Allow-Headers" ":" #field-name

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