All files / lib _http_outgoing.js

96.7% Statements 967/1000
97.2% Branches 313/322
97.92% Functions 47/48
96.7% Lines 967/1000

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 100110x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 424x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 47x 47x 47x 10x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 17846x 10x 10x 10x 10x 10x 32x 32x 32x 8x 32x 32x 10x 10x 10x 10x 1x 1x 10x 10x 10x 10x 6x 6x 10x 10x 10x 10x 3x 3x 10x 10x 10x 10x 8x 8x 8x 10x 10x 10x 10x 1x 10x 10x 1x   1x 1x 1x 1x 1x 1x 2x 2x 2x 1x 10x 10x 10x 10x 10x 502x 10x 10x 1x 1x 10x 10x 10x 10x 1x 1x                       1x 10x 10x 1x 1x 1x 1x                   10x 10x 10x 10x 10x 4x 1x 1x 3x 3x 3x 3x 4x 2x 2x 2x 2x 2x 2x 2x 2x 3x 10x 10x 10x 2x 2x 2x     10x 10x 10x 1x 1x 1x     10x 10x 10x 8x 8x 6x 6x 8x 8x 4x 2x 4x 4x 4x 4x 8x 10x 10x 10x 10x 10x 10x 10x 20x 3x 3x 17x 17x 20x 8x 18x 9x   9x 9x 17x 17x 10x 10x 10x 10x 10x 69338x 69338x 69338x 69338x 15834x 15834x 4584x 15815x 11250x 11250x 11250x 11250x 11250x 11250x 11250x 11250x 11250x 15834x 15834x 69338x 10x 10x 10x 10x 69345x 69345x 69345x 3x 3x 3x 3x 69342x 69345x 1x 1x 1x 69342x 69345x 31991x 31991x 23x 23x 31991x 31991x 31991x 37351x 37351x 37351x 37351x 37351x 69345x 10x 10x 10x 15837x 15837x 15837x 15837x 15837x 15837x 15837x 15837x 15837x 15837x 15837x 15837x 15837x 15837x 4823x 3962x 4908x 4908x 4908x 4072x 15x 13x 106x 106x 106x 15x 2x 1x 1x 1x 2x 2x 2x 1x 861x 846x 1477x 1477x 1477x 1477x 843x 4823x 15833x 15833x 15833x 15833x 15837x 13139x 13139x 15833x 15833x 15833x 15833x 15833x 15833x 15833x 15833x 15833x 15833x 15833x 15833x 15837x 15837x 2x 2x 2x 2x 2x 15833x 15833x 15837x 1x 1x 15836x 15707x 15707x 15707x 12108x 12108x 11673x 11673x 11673x 15704x 3599x 3599x 3599x 15707x 15833x 15837x 14560x 14560x 3x 3x 14560x 2640x 12956x 11917x 11917x 10604x 11902x 1312x 1312x 1313x 1x 1x 1x 1x 1x 14560x 15833x 15833x 15833x 15833x 15833x 15837x 1x 1x 15832x 15832x 15832x 15832x 15832x 15832x 15837x 15837x 10x 6493x 6493x 6493x 6493x 47x 43x 43x 43x 43x 43x 43x 4x 4x 6450x 6493x 10x 6537x 6537x 6537x 6534x 6534x 6537x 10x 6534x 6534x 6534x 6413x 6413x 6534x 126x 126x 126x 126x 98x 98x 126x 6534x 7x 7x 7x 7x 7x 6534x 1269x 1269x 1269x 6534x 6534x 6534x 9x 9x 6534x 1x 1x 6534x 6534x 10x 10x 6529x 9x 9x 10x 10x 10x 6542x 4x 4x 6541x 5x 5x 5x 10x 10x 10x 4940x 2x 2x 4938x 4938x 4938x 4938x 4938x 4939x 4927x 4927x 4927x 10x 10x 10x 10x 8038x 8038x 8038x 8038x 8038x 5490x 5490x 8038x 10x 10x 10x 10x 10x 7x 10x 10x 10x 10x 10x 6x 6x 5x 5x 5x 5x 5x 6x 12x 12x 5x 5x 10x 10x 10x 10x 10x 3x 3x 3x 2x 2x 2x 2x 7x 7x 7x 7x 2x 3x 10x 10x 10x 10x 13x 13x 13x 10x 10x 10x 10x 19x 19x 19x 1x 1x 17x 17x 17x 17x 19x 1x 1x 19x 1x 1x 19x 1x 1x 19x 7x 7x 19x 17x 18x 9x 9x 10x 10x 10x 10x 1x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 18x 18x 10x 10x 10x 10x 14660x 16x 16x 16x 14660x 14660x 14660x 14660x 14654x 10x 10x 4x 4x 4x 4x 4x 4x 4x 4x 4x 10x 4x 4x 4x 3x 3x 4x 10x 26328x 26328x 26328x 26328x 26328x 26328x 1x 26328x 13618x 26319x 12703x 12707x 6x 6x 6x 26321x 26321x 26327x 4x 26324x 2x 2x 26321x 26327x 6x 2x 6x 4x 4x 6x 6x 26315x 26318x 17230x 10480x 10480x 17230x 17230x 26314x 26321x 1x 1x 1x 1x 1x 26313x 26328x 545x 545x 545x 26313x 26313x 26328x 9071x 9071x 9071x 9071x 26304x 17242x 17242x 26313x 26313x 26313x 26328x 10x 10x 545x 545x 545x 10x 10x 10x 8x 8x 8x 8x 8x 8x 13x 13x 13x 8x 8x 13x 5x 5x 5x 13x 1x 1x 12x 1x 1x 1x 11x 11x 10x 10x 14959x 14959x 14952x 14959x 10x 10x 15827x 4x 4x 4x 15827x 10006x 10006x 10006x 15827x 15827x 11670x 2x 2x 2x 2x 2x 11668x 11668x 1601x 1601x 11668x 11668x 15827x 29x 2x   2x 2x 2x 2x 29x 4157x 2747x 130x 130x 2747x 2747x 2747x 2747x 15794x 15794x 15827x 15794x 15794x 15794x 15827x 1279x 14682x 14515x 14515x 14515x 15794x 15827x 1872x 1872x 1872x 1872x 15794x 15794x 15794x 15794x 15794x 15794x 15794x 15827x 15827x 15827x 1871x 1871x 15794x 15794x 10x 10x 10x 10x 14990x 14990x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 15586x 15586x 15586x 15581x 15581x 15581x 15581x 13119x 13119x 13305x       15581x 10x 10x 10x 15604x       15604x 15604x 15604x 15604x 13162x 13162x 13162x 13162x 13162x 13162x 13368x 40801x 40801x 40801x 13162x 13162x 13162x 13162x 13162x 13162x 13162x 10x 10x 10x 10x 9x 5x 5x 9x 9x 9x 10x 10x 10x 1x 1x 10x 10x 10x 2x 2x 10x 10x 10x 10x 10x 10x 10x  
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
 
'use strict';
 
const {
  Array,
  ArrayIsArray,
  ArrayPrototypeJoin,
  MathFloor,
  NumberPrototypeToString,
  ObjectCreate,
  ObjectDefineProperty,
  ObjectKeys,
  ObjectValues,
  ObjectPrototypeHasOwnProperty,
  ObjectSetPrototypeOf,
  RegExpPrototypeTest,
  StringPrototypeToLowerCase,
  Symbol,
} = primordials;
 
const { getDefaultHighWaterMark } = require('internal/streams/state');
const assert = require('internal/assert');
const EE = require('events');
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 {
  defaultTriggerAsyncIdScope,
  symbols: { async_id_symbol }
} = require('internal/async_hooks');
const {
  codes: {
    ERR_HTTP_HEADERS_SENT,
    ERR_HTTP_INVALID_HEADER_VALUE,
    ERR_HTTP_TRAILER_INVALID,
    ERR_INVALID_HTTP_TOKEN,
    ERR_INVALID_ARG_TYPE,
    ERR_INVALID_ARG_VALUE,
    ERR_INVALID_CHAR,
    ERR_METHOD_NOT_IMPLEMENTED,
    ERR_STREAM_CANNOT_PIPE,
    ERR_STREAM_ALREADY_FINISHED,
    ERR_STREAM_WRITE_AFTER_END,
    ERR_STREAM_NULL_VALUES,
    ERR_STREAM_DESTROYED
  },
  hideStackFrames
} = require('internal/errors');
const { validateString } = require('internal/validators');
const { isUint8Array } = require('internal/util/types');
 
let debug = require('internal/util/debuglog').debuglog('http', (fn) => {
  debug = 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
// using a case-insensitive RegExp.
function isCookieField(s) {
  return s.length === 6 && StringPrototypeToLowerCase(s) === 'cookie';
}
 
function OutgoingMessage() {
  Stream.call(this);
 
  // Queue that holds all currently pending data, until the response will be
  // assigned to the socket (until it will its turn in the HTTP pipeline).
  this.outputData = [];
 
  // `outputSize` is an approximate measure of how much data is queued on this
  // response. `_onPendingData` will be invoked to update similar global
  // per-connection counter. That counter will be used to pause/unpause the
  // TCP socket and HTTP Parser and thus handle the backpressure.
  this.outputSize = 0;
 
  this.writable = true;
  this.destroyed = false;
 
  this._last = false;
  this.chunkedEncoding = false;
  this.shouldKeepAlive = true;
  this._defaultKeepAlive = true;
  this.useChunkedEncodingByDefault = true;
  this.sendDate = false;
  this._removedConnection = false;
  this._removedContLen = false;
  this._removedTE = false;
 
  this._contentLength = null;
  this._hasBody = true;
  this._trailer = '';
  this[kNeedDrain] = false;
 
  this.finished = false;
  this._headerSent = false;
  this[kCorked] = 0;
  this._closed = false;
 
  this.socket = null;
  this._header = null;
  this[kOutHeaders] = null;
 
  this._keepAliveTimeout = 0;
 
  this._onPendingData = nop;
}
ObjectSetPrototypeOf(OutgoingMessage.prototype, Stream.prototype);
ObjectSetPrototypeOf(OutgoingMessage, Stream);
 
ObjectDefineProperty(OutgoingMessage.prototype, 'writableFinished', {
  get() {
    return (
      this.finished &&
      this.outputSize === 0 &&
      (!this.socket || this.socket.writableLength === 0)
    );
  }
});
 
ObjectDefineProperty(OutgoingMessage.prototype, 'writableObjectMode', {
  get() {
    return false;
  }
});
 
ObjectDefineProperty(OutgoingMessage.prototype, 'writableLength', {
  get() {
    return this.outputSize + (this.socket ? this.socket.writableLength : 0);
  }
});
 
ObjectDefineProperty(OutgoingMessage.prototype, 'writableHighWaterMark', {
  get() {
    return this.socket ? this.socket.writableHighWaterMark : HIGH_WATER_MARK;
  }
});
 
ObjectDefineProperty(OutgoingMessage.prototype, 'writableCorked', {
  get() {
    const corked = this.socket ? this.socket.writableCorked : 0;
    return corked + this[kCorked];
  }
});
 
ObjectDefineProperty(OutgoingMessage.prototype, '_headers', {
  get: internalUtil.deprecate(function() {
    return this.getHeaders();
  }, 'OutgoingMessage.prototype._headers is deprecated', 'DEP0066'),
  set: internalUtil.deprecate(function(val) {
    if (val == null) {
      this[kOutHeaders] = null;
    } else if (typeof val === 'object') {
      const headers = this[kOutHeaders] = ObjectCreate(null);
      const keys = ObjectKeys(val);
      // Retain for(;;) loop for performance reasons
      // Refs: https://github.com/nodejs/node/pull/30958
      for (let i = 0; i < keys.length; ++i) {
        const name = keys[i];
        headers[StringPrototypeToLowerCase(name)] = [name, val[name]];
      }
    }
  }, 'OutgoingMessage.prototype._headers is deprecated', 'DEP0066')
});
 
ObjectDefineProperty(OutgoingMessage.prototype, 'connection', {
  get: function() {
    return this.socket;
  },
  set: function(val) {
    this.socket = val;
  }
});
 
ObjectDefineProperty(OutgoingMessage.prototype, '_headerNames', {
  get: internalUtil.deprecate(function() {
    const headers = this[kOutHeaders];
    if (headers !== null) {
      const out = ObjectCreate(null);
      const keys = ObjectKeys(headers);
      // Retain for(;;) loop for performance reasons
      // Refs: https://github.com/nodejs/node/pull/30958
      for (let i = 0; i < keys.length; ++i) {
        const key = keys[i];
        const val = headers[key][0];
        out[key] = val;
      }
      return out;
    }
    return null;
  }, 'OutgoingMessage.prototype._headerNames is deprecated', 'DEP0066'),
  set: internalUtil.deprecate(function(val) {
    if (typeof val === 'object' && val !== null) {
      const headers = this[kOutHeaders];
      if (!headers)
        return;
      const keys = ObjectKeys(val);
      // Retain for(;;) loop for performance reasons
      // Refs: https://github.com/nodejs/node/pull/30958
      for (let i = 0; i < keys.length; ++i) {
        const header = headers[keys[i]];
        if (header)
          header[0] = val[keys[i]];
      }
    }
  }, 'OutgoingMessage.prototype._headerNames is deprecated', 'DEP0066')
});
 
 
OutgoingMessage.prototype._renderHeaders = function _renderHeaders() {
  if (this._header) {
    throw new ERR_HTTP_HEADERS_SENT('render');
  }
 
  const headersMap = this[kOutHeaders];
  const headers = {};
 
  if (headersMap !== null) {
    const keys = ObjectKeys(headersMap);
    // Retain for(;;) loop for performance reasons
    // Refs: https://github.com/nodejs/node/pull/30958
    for (let i = 0, l = keys.length; i < l; i++) {
      const key = keys[i];
      headers[headersMap[key][0]] = headersMap[key][1];
    }
  }
  return headers;
};
 
OutgoingMessage.prototype.cork = function() {
  if (this.socket) {
    this.socket.cork();
  } else {
    this[kCorked]++;
  }
};
 
OutgoingMessage.prototype.uncork = function() {
  if (this.socket) {
    this.socket.uncork();
  } else if (this[kCorked]) {
    this[kCorked]--;
  }
};
 
OutgoingMessage.prototype.setTimeout = function setTimeout(msecs, callback) {
 
  if (callback) {
    this.on('timeout', callback);
  }
 
  if (!this.socket) {
    this.once('socket', function socketSetTimeoutOnConnect(socket) {
      socket.setTimeout(msecs);
    });
  } else {
    this.socket.setTimeout(msecs);
  }
  return this;
};
 
 
// It's possible that the socket will be destroyed, and removed from
// any messages, before ever calling this.  In that case, just skip
// it, since something else is destroying this connection anyway.
OutgoingMessage.prototype.destroy = function destroy(error) {
  if (this.destroyed) {
    return this;
  }
  this.destroyed = true;
 
  if (this.socket) {
    this.socket.destroy(error);
  } else {
    this.once('socket', function socketDestroyOnConnect(socket) {
      socket.destroy(error);
    });
  }
 
  return this;
};
 
 
// This abstract either writing directly to the socket or buffering it.
OutgoingMessage.prototype._send = function _send(data, encoding, callback) {
  // This is a shameful hack to get the headers and first body chunk onto
  // the same packet. Future versions of Node are going to take care of
  // this at a lower level and in a more general way.
  if (!this._headerSent) {
    if (typeof data === 'string' &&
        (encoding === 'utf8' || encoding === 'latin1' || !encoding)) {
      data = this._header + data;
    } else {
      const header = this._header;
      this.outputData.unshift({
        data: header,
        encoding: 'latin1',
        callback: null
      });
      this.outputSize += header.length;
      this._onPendingData(header.length);
    }
    this._headerSent = true;
  }
  return this._writeRaw(data, encoding, callback);
};
 
 
OutgoingMessage.prototype._writeRaw = _writeRaw;
function _writeRaw(data, encoding, callback) {
  const conn = this.socket;
  if (conn && conn.destroyed) {
    // The socket was destroyed. If we're still trying to write to it,
    // then we haven't gotten the 'close' event yet.
    return false;
  }
 
  if (typeof encoding === 'function') {
    callback = encoding;
    encoding = null;
  }
 
  if (conn && conn._httpMessage === this && conn.writable) {
    // There might be pending data in the this.output buffer.
    if (this.outputData.length) {
      this._flushOutput(conn);
    }
    // Directly write to socket.
    return conn.write(data, encoding, callback);
  }
  // Buffer, as long as we're not destroyed.
  this.outputData.push({ data, encoding, callback });
  this.outputSize += data.length;
  this._onPendingData(data.length);
  return this.outputSize < HIGH_WATER_MARK;
}
 
 
OutgoingMessage.prototype._storeHeader = _storeHeader;
function _storeHeader(firstLine, headers) {
  // firstLine in the case of request is: 'GET /index.html HTTP/1.1\r\n'
  // in the case of response it is: 'HTTP/1.1 200 OK\r\n'
  const state = {
    connection: false,
    contLen: false,
    te: false,
    date: false,
    expect: false,
    trailer: false,
    header: firstLine
  };
 
  if (headers) {
    if (headers === this[kOutHeaders]) {
      for (const key in headers) {
        const entry = headers[key];
        processHeader(this, state, entry[0], entry[1], false);
      }
    } else if (ArrayIsArray(headers)) {
      if (headers.length && ArrayIsArray(headers[0])) {
        for (let i = 0; i < headers.length; i++) {
          const entry = headers[i];
          processHeader(this, state, entry[0], entry[1], true);
        }
      } else {
        if (headers.length % 2 !== 0) {
          throw new ERR_INVALID_ARG_VALUE('headers', headers);
        }
 
        for (let n = 0; n < headers.length; n += 2) {
          processHeader(this, state, headers[n + 0], headers[n + 1], true);
        }
      }
    } else {
      for (const key in headers) {
        if (ObjectPrototypeHasOwnProperty(headers, key)) {
          processHeader(this, state, key, headers[key], true);
        }
      }
    }
  }
 
  let { header } = state;
 
  // Date header
  if (this.sendDate && !state.date) {
    header += 'Date: ' + utcDate() + CRLF;
  }
 
  // Force the connection to close when the response is a 204 No Content or
  // a 304 Not Modified and the user has set a "Transfer-Encoding: chunked"
  // header.
  //
  // RFC 2616 mandates that 204 and 304 responses MUST NOT have a body but
  // node.js used to send out a zero chunk anyway to accommodate clients
  // that don't have special handling for those responses.
  //
  // It was pointed out that this might confuse reverse proxies to the point
  // of creating security liabilities, so suppress the zero chunk and force
  // the connection to close.
  if (this.chunkedEncoding && (this.statusCode === 204 ||
                               this.statusCode === 304)) {
    debug(this.statusCode + ' response should not use chunked encoding,' +
          ' closing connection.');
    this.chunkedEncoding = false;
    this.shouldKeepAlive = false;
  }
 
  // keep-alive logic
  if (this._removedConnection) {
    this._last = true;
    this.shouldKeepAlive = false;
  } else if (!state.connection) {
    const shouldSendKeepAlive = this.shouldKeepAlive &&
        (state.contLen || this.useChunkedEncodingByDefault || this.agent);
    if (shouldSendKeepAlive) {
      header += 'Connection: keep-alive' + CRLF;
      if (this._keepAliveTimeout && this._defaultKeepAlive) {
        const timeoutSeconds = MathFloor(this._keepAliveTimeout / 1000);
        header += `Keep-Alive: timeout=${timeoutSeconds}${CRLF}`;
      }
    } else {
      this._last = true;
      header += 'Connection: close' + CRLF;
    }
  }
 
  if (!state.contLen && !state.te) {
    if (!this._hasBody && (this.statusCode === 204 ||
                           this.statusCode === 304)) {
      // Make sure we don't end the 0\r\n\r\n at the end of the message.
      this.chunkedEncoding = false;
    } else if (!this.useChunkedEncodingByDefault) {
      this._last = true;
    } else if (!state.trailer &&
               !this._removedContLen &&
               typeof this._contentLength === 'number') {
      header += 'Content-Length: ' + this._contentLength + CRLF;
    } else if (!this._removedTE) {
      header += 'Transfer-Encoding: chunked' + CRLF;
      this.chunkedEncoding = true;
    } else {
      // We should only be able to get here if both Content-Length and
      // Transfer-Encoding are removed by the user.
      // See: test/parallel/test-http-remove-header-stays-removed.js
      debug('Both Content-Length and Transfer-Encoding are removed');
    }
  }
 
  // Test non-chunked message does not have trailer header set,
  // message will be terminated by the first empty line after the
  // header fields, regardless of the header fields present in the
  // message, and thus cannot contain a message body or 'trailers'.
  if (this.chunkedEncoding !== true && state.trailer) {
    throw new ERR_HTTP_TRAILER_INVALID();
  }
 
  this._header = header + CRLF;
  this._headerSent = false;
 
  // Wait until the first body chunk, or close(), is sent to flush,
  // UNLESS we're sending Expect: 100-continue.
  if (state.expect) this._send('');
}
 
function processHeader(self, state, key, value, validate) {
  if (validate)
    validateHeaderName(key);
  if (ArrayIsArray(value)) {
    if (value.length < 2 || !isCookieField(key)) {
      // Retain for(;;) loop for performance reasons
      // Refs: https://github.com/nodejs/node/pull/30958
      for (let i = 0; i < value.length; i++)
        storeHeader(self, state, key, value[i], validate);
      return;
    }
    value = ArrayPrototypeJoin(value, '; ');
  }
  storeHeader(self, state, key, value, validate);
}
 
function storeHeader(self, state, key, value, validate) {
  if (validate)
    validateHeaderValue(key, value);
  state.header += key + ': ' + value + CRLF;
  matchHeader(self, state, key, value);
}
 
function matchHeader(self, state, field, value) {
  if (field.length < 4 || field.length > 17)
    return;
  field = StringPrototypeToLowerCase(field);
  switch (field) {
    case 'connection':
      state.connection = true;
      self._removedConnection = false;
      if (RegExpPrototypeTest(RE_CONN_CLOSE, value))
        self._last = true;
      else
        self.shouldKeepAlive = true;
      break;
    case 'transfer-encoding':
      state.te = true;
      self._removedTE = false;
      if (RegExpPrototypeTest(RE_TE_CHUNKED, value))
        self.chunkedEncoding = true;
      break;
    case 'content-length':
      state.contLen = true;
      self._removedContLen = false;
      break;
    case 'date':
    case 'expect':
    case 'trailer':
      state[field] = true;
      break;
    case 'keep-alive':
      self._defaultKeepAlive = false;
      break;
  }
}
 
const validateHeaderName = hideStackFrames((name) => {
  if (typeof name !== 'string' || !name || !checkIsHttpToken(name)) {
    throw new ERR_INVALID_HTTP_TOKEN('Header name', name);
  }
});
 
const validateHeaderValue = hideStackFrames((name, value) => {
  if (value === undefined) {
    throw new ERR_HTTP_INVALID_HEADER_VALUE(value, name);
  }
  if (checkInvalidHeaderChar(value)) {
    debug('Header "%s" contains invalid characters', name);
    throw new ERR_INVALID_CHAR('header content', name);
  }
});
 
OutgoingMessage.prototype.setHeader = function setHeader(name, value) {
  if (this._header) {
    throw new ERR_HTTP_HEADERS_SENT('set');
  }
  validateHeaderName(name);
  validateHeaderValue(name, value);
 
  let headers = this[kOutHeaders];
  if (headers === null)
    this[kOutHeaders] = headers = ObjectCreate(null);
 
  headers[StringPrototypeToLowerCase(name)] = [name, value];
  return this;
};
 
 
OutgoingMessage.prototype.getHeader = function getHeader(name) {
  validateString(name, 'name');
 
  const headers = this[kOutHeaders];
  if (headers === null)
    return;
 
  const entry = headers[StringPrototypeToLowerCase(name)];
  return entry && entry[1];
};
 
 
// Returns an array of the names of the current outgoing headers.
OutgoingMessage.prototype.getHeaderNames = function getHeaderNames() {
  return this[kOutHeaders] !== null ? ObjectKeys(this[kOutHeaders]) : [];
};
 
 
// Returns an array of the names of the current outgoing raw headers.
OutgoingMessage.prototype.getRawHeaderNames = function getRawHeaderNames() {
  const headersMap = this[kOutHeaders];
  if (headersMap === null) return [];
 
  const values = ObjectValues(headersMap);
  const headers = Array(values.length);
  // Retain for(;;) loop for performance reasons
  // Refs: https://github.com/nodejs/node/pull/30958
  for (let i = 0, l = values.length; i < l; i++) {
    headers[i] = values[i][0];
  }
 
  return headers;
};
 
 
// Returns a shallow copy of the current outgoing headers.
OutgoingMessage.prototype.getHeaders = function getHeaders() {
  const headers = this[kOutHeaders];
  const ret = ObjectCreate(null);
  if (headers) {
    const keys = ObjectKeys(headers);
    // Retain for(;;) loop for performance reasons
    // Refs: https://github.com/nodejs/node/pull/30958
    for (let i = 0; i < keys.length; ++i) {
      const key = keys[i];
      const val = headers[key][1];
      ret[key] = val;
    }
  }
  return ret;
};
 
 
OutgoingMessage.prototype.hasHeader = function hasHeader(name) {
  validateString(name, 'name');
  return this[kOutHeaders] !== null &&
    !!this[kOutHeaders][StringPrototypeToLowerCase(name)];
};
 
 
OutgoingMessage.prototype.removeHeader = function removeHeader(name) {
  validateString(name, 'name');
 
  if (this._header) {
    throw new ERR_HTTP_HEADERS_SENT('remove');
  }
 
  const key = StringPrototypeToLowerCase(name);
 
  switch (key) {
    case 'connection':
      this._removedConnection = true;
      break;
    case 'content-length':
      this._removedContLen = true;
      break;
    case 'transfer-encoding':
      this._removedTE = true;
      break;
    case 'date':
      this.sendDate = false;
      break;
  }
 
  if (this[kOutHeaders] !== null) {
    delete this[kOutHeaders][key];
  }
};
 
 
OutgoingMessage.prototype._implicitHeader = function _implicitHeader() {
  throw new ERR_METHOD_NOT_IMPLEMENTED('_implicitHeader()');
};
 
ObjectDefineProperty(OutgoingMessage.prototype, 'headersSent', {
  configurable: true,
  enumerable: true,
  get: function() { return !!this._header; }
});
 
ObjectDefineProperty(OutgoingMessage.prototype, 'writableEnded', {
  get: function() { return this.finished; }
});
 
ObjectDefineProperty(OutgoingMessage.prototype, 'writableNeedDrain', {
  get: function() {
    return !this.destroyed && !this.finished && this[kNeedDrain];
  }
});
 
const crlf_buf = Buffer.from(CRLF);
OutgoingMessage.prototype.write = function write(chunk, encoding, callback) {
  if (typeof encoding === 'function') {
    callback = encoding;
    encoding = null;
  }
 
  const ret = write_(this, chunk, encoding, callback, false);
  if (!ret)
    this[kNeedDrain] = true;
  return ret;
};
 
function onError(msg, err, callback) {
  const triggerAsyncId = msg.socket ? msg.socket[async_id_symbol] : undefined;
  defaultTriggerAsyncIdScope(triggerAsyncId,
                             process.nextTick,
                             emitErrorNt,
                             msg,
                             err,
                             callback);
}
 
function emitErrorNt(msg, err, callback) {
  callback(err);
  if (typeof msg.emit === 'function' && !msg._closed) {
    msg.emit('error', err);
  }
}
 
function write_(msg, chunk, encoding, callback, fromEnd) {
  if (typeof callback !== 'function')
    callback = nop;
 
  let len;
  if (chunk === null) {
    throw new ERR_STREAM_NULL_VALUES();
  } else if (typeof chunk === 'string') {
    len = Buffer.byteLength(chunk, encoding);
  } else if (isUint8Array(chunk)) {
    len = chunk.length;
  } else {
    throw new ERR_INVALID_ARG_TYPE(
      'chunk', ['string', 'Buffer', 'Uint8Array'], chunk);
  }
 
  let err;
  if (msg.finished) {
    err = new ERR_STREAM_WRITE_AFTER_END();
  } else if (msg.destroyed) {
    err = new ERR_STREAM_DESTROYED('write');
  }
 
  if (err) {
    if (!msg.destroyed) {
      onError(msg, err, callback);
    } else {
      process.nextTick(callback, err);
    }
    return false;
  }
 
  if (!msg._header) {
    if (fromEnd) {
      msg._contentLength = len;
    }
    msg._implicitHeader();
  }
 
  if (!msg._hasBody) {
    debug('This type of response MUST NOT have a body. ' +
          'Ignoring write() calls.');
    process.nextTick(callback);
    return true;
  }
 
  if (!fromEnd && msg.socket && !msg.socket.writableCorked) {
    msg.socket.cork();
    process.nextTick(connectionCorkNT, msg.socket);
  }
 
  let ret;
  if (msg.chunkedEncoding && chunk.length !== 0) {
    msg._send(NumberPrototypeToString(len, 16), 'latin1', null);
    msg._send(crlf_buf, null, null);
    msg._send(chunk, encoding, null);
    ret = msg._send(crlf_buf, null, callback);
  } else {
    ret = msg._send(chunk, encoding, callback);
  }
 
  debug('write ret = ' + ret);
  return ret;
}
 
 
function connectionCorkNT(conn) {
  conn.uncork();
}
 
 
OutgoingMessage.prototype.addTrailers = function addTrailers(headers) {
  this._trailer = '';
  const keys = ObjectKeys(headers);
  const isArray = ArrayIsArray(headers);
  // Retain for(;;) loop for performance reasons
  // Refs: https://github.com/nodejs/node/pull/30958
  for (let i = 0, l = keys.length; i < l; i++) {
    let field, value;
    const key = keys[i];
    if (isArray) {
      field = headers[key][0];
      value = headers[key][1];
    } else {
      field = key;
      value = headers[key];
    }
    if (typeof field !== 'string' || !field || !checkIsHttpToken(field)) {
      throw new ERR_INVALID_HTTP_TOKEN('Trailer name', field);
    }
    if (checkInvalidHeaderChar(value)) {
      debug('Trailer "%s" contains invalid characters', field);
      throw new ERR_INVALID_CHAR('trailer content', field);
    }
    this._trailer += field + ': ' + value + CRLF;
  }
};
 
function onFinish(outmsg) {
  if (outmsg && outmsg.socket && outmsg.socket._hadError) return;
  outmsg.emit('finish');
}
 
OutgoingMessage.prototype.end = function end(chunk, encoding, callback) {
  if (typeof chunk === 'function') {
    callback = chunk;
    chunk = null;
    encoding = null;
  } else if (typeof encoding === 'function') {
    callback = encoding;
    encoding = null;
  }
 
  if (chunk) {
    if (this.finished) {
      onError(this,
              new ERR_STREAM_WRITE_AFTER_END(),
              typeof callback !== 'function' ? nop : callback);
      return this;
    }
 
    if (this.socket) {
      this.socket.cork();
    }
 
    write_(this, chunk, encoding, null, true);
  } else if (this.finished) {
    if (typeof callback === 'function') {
      if (!this.writableFinished) {
        this.on('finish', callback);
      } else {
        callback(new ERR_STREAM_ALREADY_FINISHED('end'));
      }
    }
    return this;
  } else if (!this._header) {
    if (this.socket) {
      this.socket.cork();
    }
 
    this._contentLength = 0;
    this._implicitHeader();
  }
 
  if (typeof callback === 'function')
    this.once('finish', callback);
 
  const finish = onFinish.bind(undefined, this);
 
  if (this._hasBody && this.chunkedEncoding) {
    this._send('0\r\n' + this._trailer + '\r\n', 'latin1', finish);
  } else {
    // Force a flush, HACK.
    this._send('', 'latin1', finish);
  }
 
  if (this.socket) {
    // Fully uncork connection on end().
    this.socket._writableState.corked = 1;
    this.socket.uncork();
  }
  this[kCorked] = 0;
 
  this.finished = true;
 
  // There is the first message on the outgoing queue, and we've sent
  // everything to the socket.
  debug('outgoing message end.');
  if (this.outputData.length === 0 &&
      this.socket &&
      this.socket._httpMessage === this) {
    this._finish();
  }
 
  return this;
};
 
 
OutgoingMessage.prototype._finish = function _finish() {
  assert(this.socket);
  this.emit('prefinish');
};
 
 
// This logic is probably a bit confusing. Let me explain a bit:
//
// In both HTTP servers and clients it is possible to queue up several
// outgoing messages. This is easiest to imagine in the case of a client.
// Take the following situation:
//
//    req1 = client.request('GET', '/');
//    req2 = client.request('POST', '/');
//
// When the user does
//
//   req2.write('hello world\n');
//
// it's possible that the first request has not been completely flushed to
// the socket yet. Thus the outgoing messages need to be prepared to queue
// up data internally before sending it on further to the socket's queue.
//
// This function, outgoingFlush(), is called by both the Server and Client
// to attempt to flush any pending messages out to the socket.
OutgoingMessage.prototype._flush = function _flush() {
  const socket = this.socket;
 
  if (socket && socket.writable) {
    // There might be remaining data in this.output; write it out
    const ret = this._flushOutput(socket);
 
    if (this.finished) {
      // This is a queue to the server or client to bring in the next this.
      this._finish();
    } else if (ret && this[kNeedDrain]) {
      this[kNeedDrain] = false;
      this.emit('drain');
    }
  }
};
 
OutgoingMessage.prototype._flushOutput = function _flushOutput(socket) {
  while (this[kCorked]) {
    this[kCorked]--;
    socket.cork();
  }
 
  const outputLength = this.outputData.length;
  if (outputLength <= 0)
    return undefined;
 
  const outputData = this.outputData;
  socket.cork();
  let ret;
  // Retain for(;;) loop for performance reasons
  // Refs: https://github.com/nodejs/node/pull/30958
  for (let i = 0; i < outputLength; i++) {
    const { data, encoding, callback } = outputData[i];
    ret = socket.write(data, encoding, callback);
  }
  socket.uncork();
 
  this.outputData = [];
  this._onPendingData(-this.outputSize);
  this.outputSize = 0;
 
  return ret;
};
 
 
OutgoingMessage.prototype.flushHeaders = function flushHeaders() {
  if (!this._header) {
    this._implicitHeader();
  }
 
  // Force-flush the headers.
  this._send('');
};
 
OutgoingMessage.prototype.pipe = function pipe() {
  // OutgoingMessage should be write-only. Piping from it is disabled.
  this.emit('error', new ERR_STREAM_CANNOT_PIPE());
};
 
OutgoingMessage.prototype[EE.captureRejectionSymbol] =
function(err, event) {
  this.destroy(err);
};
 
module.exports = {
  validateHeaderName,
  validateHeaderValue,
  OutgoingMessage
};