http: use CRLF conistently in _http_outgoing.js

PR-URL: #37851
Reviewed-By: Zeyu Yang <himself65@outlook.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/_http_outgoing.js

@@ -502,14 +502,14 @@ function _storeHeader(firstLine, headers) {
     const shouldSendKeepAlive = this.shouldKeepAlive &&
         (state.contLen || this.useChunkedEncodingByDefault || this.agent);
     if (shouldSendKeepAlive) {
-      header += 'Connection: keep-alive\r\n';
+      header += 'Connection: keep-alive' + CRLF;
       if (this._keepAliveTimeout && this._defaultKeepAlive) {
         const timeoutSeconds = MathFloor(this._keepAliveTimeout / 1000);
-        header += `Keep-Alive: timeout=${timeoutSeconds}\r\n`;
+        header += `Keep-Alive: timeout=${timeoutSeconds}${CRLF}`;
       }
     } else {
       this._last = true;
-      header += 'Connection: close\r\n';
+      header += 'Connection: close' + CRLF;
     }
   }
 
@@ -525,7 +525,7 @@ function _storeHeader(firstLine, headers) {
                typeof this._contentLength === 'number') {
       header += 'Content-Length: ' + this._contentLength + CRLF;
     } else if (!this._removedTE) {
-      header += 'Transfer-Encoding: chunked\r\n';
+      header += 'Transfer-Encoding: chunked' + CRLF;
       this.chunkedEncoding = true;
     } else {
       // We should only be able to get here if both Content-Length and
@@ -740,7 +740,7 @@ ObjectDefineProperty(OutgoingMessage.prototype, 'headersSent', {
   get: function() { return !!this._header; }
 });
 
-const crlf_buf = Buffer.from('\r\n');
+const crlf_buf = Buffer.from(CRLF);
 OutgoingMessage.prototype.write = function write(chunk, encoding, callback) {
   if (typeof encoding === 'function') {
     callback = encoding;
@@ -903,7 +903,7 @@ OutgoingMessage.prototype.end = function end(chunk, encoding, callback) {
     state.finalCalled = true;
 
     if (this._hasBody && this.chunkedEncoding) {
-      this._send('0\r\n' + this._trailer + '\r\n', 'latin1', finish);
+      this._send('0' + CRLF + this._trailer + CRLF, 'latin1', finish);
     } else {
       // Force a flush, HACK.
       this._send('', 'latin1', finish);