Add MIME_ZIP and HEADER_ContentDisposition (#513)

Co-authored-by: 飞泽锴 <[email protected]>

constants.go

@@ -7,12 +7,14 @@ package restful
 const (
 	MIME_XML   = "application/xml"          // Accept or Content-Type used in Consumes() and/or Produces()
 	MIME_JSON  = "application/json"         // Accept or Content-Type used in Consumes() and/or Produces()
+	MIME_ZIP   = "application/zip"          // Accept or Content-Type used in Consumes() and/or Produces()
 	MIME_OCTET = "application/octet-stream" // If Content-Type is not present in request, use the default
 
 	HEADER_Allow                         = "Allow"
 	HEADER_Accept                        = "Accept"
 	HEADER_Origin                        = "Origin"
 	HEADER_ContentType                   = "Content-Type"
+	HEADER_ContentDisposition            = "Content-Disposition"
 	HEADER_LastModified                  = "Last-Modified"
 	HEADER_AcceptEncoding                = "Accept-Encoding"
 	HEADER_ContentEncoding               = "Content-Encoding"