text: package restful
  
  import "strings"
  
  // Copyright 2013 Ernest Micklei. All rights reserved.
  // Use of this source code is governed by a license
  // that can be found in the LICENSE file.
  
  // OPTIONSFilter is a filter function that inspects the Http Request for the OPTIONS method
  // and provides the response with a set of allowed methods for the request URL Path.
  // As for any filter, you can also install it for a particular WebService within a Container.
  // Note: this filter is not needed when using CrossOriginResourceSharing (for CORS).
  func (c *Container) OPTIONSFilter(req *Request, resp *Response, chain *FilterChain) {
  	if "OPTIONS" != req.Request.Method {
  		chain.ProcessFilter(req, resp)
  		return
  	}
  
  	archs := req.Request.Header.Get(HEADER_AccessControlRequestHeaders)
  	methods := strings.Join(c.computeAllowedMethods(req), ",")
  	origin := req.Request.Header.Get(HEADER_Origin)
  
  	resp.AddHeader(HEADER_Allow, methods)
  	resp.AddHeader(HEADER_AccessControlAllowOrigin, origin)
  	resp.AddHeader(HEADER_AccessControlAllowHeaders, archs)
  	resp.AddHeader(HEADER_AccessControlAllowMethods, methods)
  }
  
  // OPTIONSFilter is a filter function that inspects the Http Request for the OPTIONS method
  // and provides the response with a set of allowed methods for the request URL Path.
  // Note: this filter is not needed when using CrossOriginResourceSharing (for CORS).
  func OPTIONSFilter() FilterFunction {
  	return DefaultContainer.OPTIONSFilter
  }
  