enhancement: Support Skyhigh Security ICAP as an ICAP server

vendor/github.com/egirna/icap-client/conn.go

@@ -102,13 +102,12 @@ func (c *ICAPConn) Send(in []byte) ([]byte, error) {
 			data = append(data, tmp[:n]...)
 
 			// explicitly breaking because the Read blocks for 100 continue message
-			// fixMe: still unclear why this is happening, find out and fix it
 			if bytes.Equal(data, []byte(icap100ContinueMsg)) {
 				break
 			}
 
-			// EOF detected, 0 Double crlf indicates the end of the message
-			if bytes.HasSuffix(data, []byte("0\r\n\r\n")) {
+			// EOF detected, double crlf indicates the end of the message
+			if bytes.HasSuffix(data, []byte(doubleCRLF)) {
 				break
 			}
 

vendor/github.com/egirna/icap-client/icap_client.go

@@ -55,7 +55,7 @@ const (
 	schemeHTTPReq                   = "http_request"
 	schemeHTTPResp                  = "http_response"
 	crlf                            = "\r\n"
-	doubleCRLF                      = "\r\n\r\n"
+	doubleCRLF                      = crlf + crlf
 	lf                              = "\n"
 	bodyEndIndicator                = crlf + "0" + crlf
 	fullBodyEndIndicatorPreviewMode = "; ieof" + doubleCRLF