http: remove CRLF variable

PR-URL: #40101
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>

Author: shfshanyue

lib/_http_common.js

@@ -268,7 +268,7 @@ module.exports = {
   _checkIsHttpToken: checkIsHttpToken,
   chunkExpression: /(?:^|\W)chunked(?:$|\W)/i,
   continueExpression: /(?:^|\W)100-continue(?:$|\W)/i,
-  CRLF: '\r\n',
+  CRLF: '\r\n', // TODO: Deprecate this.
   freeParser,
   methods,
   parsers,

lib/_http_outgoing.js

@@ -45,9 +45,11 @@ const Stream = require('stream');
 const internalUtil = require('internal/util');
 const { kOutHeaders, utcDate, kNeedDrain } = require('internal/http');
 const { Buffer } = require('buffer');
-const common = require('_http_common');
-const checkIsHttpToken = common._checkIsHttpToken;
-const checkInvalidHeaderChar = common._checkInvalidHeaderChar;
+const {
+  _checkIsHttpToken: checkIsHttpToken,
+  _checkInvalidHeaderChar: checkInvalidHeaderChar,
+  chunkExpression: RE_TE_CHUNKED,
+} = require('_http_common');
 const {
   defaultTriggerAsyncIdScope,
   symbols: { async_id_symbol }
@@ -78,14 +80,12 @@ let debug = require('internal/util/debuglog').debuglog('http', (fn) => {
 });
 
 const HIGH_WATER_MARK = getDefaultHighWaterMark();
-const { CRLF } = common;
 
 const kCorked = Symbol('corked');
 
 const nop = () => {};
 
 const RE_CONN_CLOSE = /(?:^|\W)close(?:$|\W)/i;
-const RE_TE_CHUNKED = common.chunkExpression;
 
 // isCookieField performs a case-insensitive comparison of a provided string
 // against the word "cookie." As of V8 6.6 this is faster than handrolling or
@@ -417,7 +417,7 @@ function _storeHeader(firstLine, headers) {
 
   // Date header
   if (this.sendDate && !state.date) {
-    header += 'Date: ' + utcDate() + CRLF;
+    header += 'Date: ' + utcDate() + '\r\n';
   }
 
   // Force the connection to close when the response is a 204 No Content or
@@ -447,14 +447,14 @@ function _storeHeader(firstLine, headers) {
     const shouldSendKeepAlive = this.shouldKeepAlive &&
         (state.contLen || this.useChunkedEncodingByDefault || this.agent);
     if (shouldSendKeepAlive) {
-      header += 'Connection: keep-alive' + CRLF;
+      header += 'Connection: keep-alive\r\n';
       if (this._keepAliveTimeout && this._defaultKeepAlive) {
         const timeoutSeconds = MathFloor(this._keepAliveTimeout / 1000);
-        header += `Keep-Alive: timeout=${timeoutSeconds}${CRLF}`;
+        header += `Keep-Alive: timeout=${timeoutSeconds}\r\n`;
       }
     } else {
       this._last = true;
-      header += 'Connection: close' + CRLF;
+      header += 'Connection: close\r\n';
     }
   }
 
@@ -467,9 +467,9 @@ function _storeHeader(firstLine, headers) {
     } else if (!state.trailer &&
                !this._removedContLen &&
                typeof this._contentLength === 'number') {
-      header += 'Content-Length: ' + this._contentLength + CRLF;
+      header += 'Content-Length: ' + this._contentLength + '\r\n';
     } else if (!this._removedTE) {
-      header += 'Transfer-Encoding: chunked' + CRLF;
+      header += 'Transfer-Encoding: chunked\r\n';
       this.chunkedEncoding = true;
     } else {
       // We should only be able to get here if both Content-Length and
@@ -487,7 +487,7 @@ function _storeHeader(firstLine, headers) {
     throw new ERR_HTTP_TRAILER_INVALID();
   }
 
-  this._header = header + CRLF;
+  this._header = header + '\r\n';
   this._headerSent = false;
 
   // Wait until the first body chunk, or close(), is sent to flush,
@@ -514,7 +514,7 @@ function processHeader(self, state, key, value, validate) {
 function storeHeader(self, state, key, value, validate) {
   if (validate)
     validateHeaderValue(key, value);
-  state.header += key + ': ' + value + CRLF;
+  state.header += key + ': ' + value + '\r\n';
   matchHeader(self, state, key, value);
 }
 
@@ -694,7 +694,7 @@ ObjectDefineProperty(OutgoingMessage.prototype, 'writableNeedDrain', {
   }
 });
 
-const crlf_buf = Buffer.from(CRLF);
+const crlf_buf = Buffer.from('\r\n');
 OutgoingMessage.prototype.write = function write(chunk, encoding, callback) {
   if (typeof encoding === 'function') {
     callback = encoding;
@@ -818,7 +818,7 @@ OutgoingMessage.prototype.addTrailers = function addTrailers(headers) {
       debug('Trailer "%s" contains invalid characters', field);
       throw new ERR_INVALID_CHAR('trailer content', field);
     }
-    this._trailer += field + ': ' + value + CRLF;
+    this._trailer += field + ': ' + value + '\r\n';
   }
 };
 

lib/_http_server.js

@@ -37,7 +37,6 @@ const assert = require('internal/assert');
 const {
   parsers,
   freeParser,
-  CRLF,
   continueExpression,
   chunkExpression,
   kIncomingMessage,
@@ -254,12 +253,12 @@ ServerResponse.prototype.detachSocket = function detachSocket(socket) {
 };
 
 ServerResponse.prototype.writeContinue = function writeContinue(cb) {
-  this._writeRaw(`HTTP/1.1 100 Continue${CRLF}${CRLF}`, 'ascii', cb);
+  this._writeRaw('HTTP/1.1 100 Continue\r\n\r\n', 'ascii', cb);
   this._sent100 = true;
 };
 
 ServerResponse.prototype.writeProcessing = function writeProcessing(cb) {
-  this._writeRaw(`HTTP/1.1 102 Processing${CRLF}${CRLF}`, 'ascii', cb);
+  this._writeRaw('HTTP/1.1 102 Processing\r\n\r\n', 'ascii', cb);
 };
 
 ServerResponse.prototype._implicitHeader = function _implicitHeader() {
@@ -322,7 +321,7 @@ function writeHead(statusCode, reason, obj) {
   if (checkInvalidHeaderChar(this.statusMessage))
     throw new ERR_INVALID_CHAR('statusMessage');
 
-  const statusLine = `HTTP/1.1 ${statusCode} ${this.statusMessage}${CRLF}`;
+  const statusLine = `HTTP/1.1 ${statusCode} ${this.statusMessage}\r\n`;
 
   if (statusCode === 204 || statusCode === 304 ||
       (statusCode >= 100 && statusCode <= 199)) {
@@ -648,16 +647,16 @@ function onParserTimeout(server, socket) {
 
 const noop = () => {};
 const badRequestResponse = Buffer.from(
-  `HTTP/1.1 400 ${STATUS_CODES[400]}${CRLF}` +
-  `Connection: close${CRLF}${CRLF}`, 'ascii'
+  `HTTP/1.1 400 ${STATUS_CODES[400]}\r\n` +
+  'Connection: close\r\n\r\n', 'ascii'
 );
 const requestTimeoutResponse = Buffer.from(
-  `HTTP/1.1 408 ${STATUS_CODES[408]}${CRLF}` +
-  `Connection: close${CRLF}${CRLF}`, 'ascii'
+  `HTTP/1.1 408 ${STATUS_CODES[408]}\r\n` +
+  'Connection: close\r\n\r\n', 'ascii'
 );
 const requestHeaderFieldsTooLargeResponse = Buffer.from(
-  `HTTP/1.1 431 ${STATUS_CODES[431]}${CRLF}` +
-  `Connection: close${CRLF}${CRLF}`, 'ascii'
+  `HTTP/1.1 431 ${STATUS_CODES[431]}\r\n` +
+  'Connection: close\r\n\r\n', 'ascii'
 );
 function socketOnError(e) {
   // Ignore further errors