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  25 <div class="section">
  26 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
  27 <a name="beast.examples"></a><a class="link" href="examples.html" title="Examples">Examples</a>
  28 </h2></div></div></div>
  29 <p>
  30       Source code and build scripts for these programs are located in the <a href="../../../example" target="_top">example</a> directory.
  31     </p>
  32 <div class="section">
  33 <div class="titlepage"><div><div><h3 class="title">
  34 <a name="beast.examples.clients"></a><a class="link" href="examples.html#beast.examples.clients" title="Clients">Clients</a>
  35 </h3></div></div></div>
  36 <p>
  37         These HTTP clients submit a GET request to a server specified on the command
  38         line, and prints the resulting response. The crawl client asynchronously
  39         fetches the document root of the 10,000 top ranked domains, this may be used
  40         to evaluate robustness. All asynchronous clients support timeouts.
  41       </p>
  42 <div class="informaltable"><table class="table">
  43 <colgroup>
  44 <col>
  45 <col>
  46 <col>
  47 </colgroup>
  48 <thead><tr>
  49 <th>
  50                 <p>
  51                   Description
  52                 </p>
  53               </th>
  54 <th>
  55                 <p>
  56                   Source File
  57                 </p>
  58               </th>
  59 <th>
  60                 <p>
  61                   Source File (using SSL)
  62                 </p>
  63               </th>
  64 </tr></thead>
  65 <tbody>
  66 <tr>
  67 <td>
  68                 <p>
  69                   HTTP, synchronous
  70                 </p>
  71               </td>
  72 <td>
  73                 <p>
  74                   <a href="../../../example/http/client/sync/http_client_sync.cpp" target="_top">http_client_sync.cpp</a>
  75                 </p>
  76               </td>
  77 <td>
  78                 <p>
  79                   <a href="../../../example/http/client/sync-ssl/http_client_sync_ssl.cpp" target="_top">http_client_sync_ssl.cpp</a>
  80                 </p>
  81               </td>
  82 </tr>
  83 <tr>
  84 <td>
  85                 <p>
  86                   HTTP, asynchronous
  87                 </p>
  88               </td>
  89 <td>
  90                 <p>
  91                   <a href="../../../example/http/client/async/http_client_async.cpp" target="_top">http_client_async.cpp</a>
  92                 </p>
  93               </td>
  94 <td>
  95                 <p>
  96                   <a href="../../../example/http/client/async-ssl/http_client_async_ssl.cpp" target="_top">http_client_async_ssl.cpp</a>
  97                 </p>
  98               </td>
  99 </tr>
 100 <tr>
 101 <td>
 102                 <p>
 103                   HTTP, asynchronous using <a href="../../../../../doc/html/boost_asio/reference/system_executor.html" target="_top"><code class="computeroutput"><span class="identifier">net</span><span class="special">::</span><span class="identifier">system_executor</span></code></a>
 104                 </p>
 105               </td>
 106 <td>
 107               </td>
 108 <td>
 109                 <p>
 110                   <a href="../../../example/http/client/async-ssl-system-executor/http_client_async_ssl_system_executor.cpp" target="_top">http_client_async_ssl_system_executor.cpp</a>
 111                 </p>
 112               </td>
 113 </tr>
 114 <tr>
 115 <td>
 116                 <p>
 117                   HTTP, coroutine
 118                 </p>
 119               </td>
 120 <td>
 121                 <p>
 122                   <a href="../../../example/http/client/coro/http_client_coro.cpp" target="_top">http_client_coro.cpp</a>
 123                 </p>
 124               </td>
 125 <td>
 126                 <p>
 127                   <a href="../../../example/http/client/coro-ssl/http_client_coro_ssl.cpp" target="_top">http_client_coro_ssl.cpp</a>
 128                 </p>
 129               </td>
 130 </tr>
 131 <tr>
 132 <td>
 133                 <p>
 134                   HTTP crawl (asynchronous)
 135                 </p>
 136               </td>
 137 <td>
 138                 <p>
 139                   <a href="../../../example/http/client/crawl/http_crawl.cpp" target="_top">http_crawl.cpp</a>
 140                 </p>
 141               </td>
 142 <td>
 143               </td>
 144 </tr>
 145 </tbody>
 146 </table></div>
 147 <p>
 148         These WebSocket clients connect to a server and send a message, then receive
 149         a message and print the response before disconnecting. All asynchronous clients
 150         support timeouts.
 151       </p>
 152 <div class="informaltable"><table class="table">
 153 <colgroup>
 154 <col>
 155 <col>
 156 <col>
 157 </colgroup>
 158 <thead><tr>
 159 <th>
 160                 <p>
 161                   Description
 162                 </p>
 163               </th>
 164 <th>
 165                 <p>
 166                   Source File
 167                 </p>
 168               </th>
 169 <th>
 170                 <p>
 171                   Source File (using SSL)
 172                 </p>
 173               </th>
 174 </tr></thead>
 175 <tbody>
 176 <tr>
 177 <td>
 178                 <p>
 179                   WebSocket, synchronous
 180                 </p>
 181               </td>
 182 <td>
 183                 <p>
 184                   <a href="../../../example/websocket/client/sync/websocket_client_sync.cpp" target="_top">websocket_client_sync.cpp</a>
 185                 </p>
 186               </td>
 187 <td>
 188                 <p>
 189                   <a href="../../../example/websocket/client/sync-ssl/websocket_client_sync_ssl.cpp" target="_top">websocket_client_sync_ssl.cpp</a>
 190                 </p>
 191               </td>
 192 </tr>
 193 <tr>
 194 <td>
 195                 <p>
 196                   WebSocket, asynchronous
 197                 </p>
 198               </td>
 199 <td>
 200                 <p>
 201                   <a href="../../../example/websocket/client/async/websocket_client_async.cpp" target="_top">websocket_client_async.cpp</a>
 202                 </p>
 203               </td>
 204 <td>
 205                 <p>
 206                   <a href="../../../example/websocket/client/async-ssl/websocket_client_async_ssl.cpp" target="_top">websocket_client_async_ssl.cpp</a>
 207                 </p>
 208               </td>
 209 </tr>
 210 <tr>
 211 <td>
 212                 <p>
 213                   WebSocket, asynchronous using <a href="../../../../../doc/html/boost_asio/reference/system_executor.html" target="_top"><code class="computeroutput"><span class="identifier">net</span><span class="special">::</span><span class="identifier">system_executor</span></code></a>
 214                 </p>
 215               </td>
 216 <td>
 217               </td>
 218 <td>
 219                 <p>
 220                   <a href="../../../example/websocket/client/async-ssl-system-executor/websocket_client_async_ssl_system_executor.cpp" target="_top">websocket_client_async_ssl_system_executor.cpp</a>
 221                 </p>
 222               </td>
 223 </tr>
 224 <tr>
 225 <td>
 226                 <p>
 227                   WebSocket, coroutine
 228                 </p>
 229               </td>
 230 <td>
 231                 <p>
 232                   <a href="../../../example/websocket/client/coro/websocket_client_coro.cpp" target="_top">websocket_client_coro.cpp</a>
 233                 </p>
 234               </td>
 235 <td>
 236                 <p>
 237                   <a href="../../../example/websocket/client/coro-ssl/websocket_client_coro_ssl.cpp" target="_top">websocket_client_coro_ssl.cpp</a>
 238                 </p>
 239               </td>
 240 </tr>
 241 </tbody>
 242 </table></div>
 243 </div>
 244 <div class="section">
 245 <div class="titlepage"><div><div><h3 class="title">
 246 <a name="beast.examples.servers"></a><a class="link" href="examples.html#beast.examples.servers" title="Servers">Servers</a>
 247 </h3></div></div></div>
 248 <p>
 249         These HTTP servers deliver files from a root directory specified on the command
 250         line. All asynchronous servers support timeouts.
 251       </p>
 252 <div class="informaltable"><table class="table">
 253 <colgroup>
 254 <col>
 255 <col>
 256 <col>
 257 </colgroup>
 258 <thead><tr>
 259 <th>
 260                 <p>
 261                   Description
 262                 </p>
 263               </th>
 264 <th>
 265                 <p>
 266                   Source File
 267                 </p>
 268               </th>
 269 <th>
 270                 <p>
 271                   Source File (using SSL)
 272                 </p>
 273               </th>
 274 </tr></thead>
 275 <tbody>
 276 <tr>
 277 <td>
 278                 <p>
 279                   HTTP, synchronous
 280                 </p>
 281               </td>
 282 <td>
 283                 <p>
 284                   <a href="../../../example/http/server/sync/http_server_sync.cpp" target="_top">http_server_sync.cpp</a>
 285                 </p>
 286               </td>
 287 <td>
 288                 <p>
 289                   <a href="../../../example/http/server/sync-ssl/http_server_sync_ssl.cpp" target="_top">http_server_sync_ssl.cpp</a>
 290                 </p>
 291               </td>
 292 </tr>
 293 <tr>
 294 <td>
 295                 <p>
 296                   HTTP, asynchronous
 297                 </p>
 298               </td>
 299 <td>
 300                 <p>
 301                   <a href="../../../example/http/server/async/http_server_async.cpp" target="_top">http_server_async.cpp</a>
 302                 </p>
 303               </td>
 304 <td>
 305                 <p>
 306                   <a href="../../../example/http/server/async-ssl/http_server_async_ssl.cpp" target="_top">http_server_async_ssl.cpp</a>
 307                 </p>
 308               </td>
 309 </tr>
 310 <tr>
 311 <td>
 312                 <p>
 313                   HTTP, coroutine
 314                 </p>
 315               </td>
 316 <td>
 317                 <p>
 318                   <a href="../../../example/http/server/coro/http_server_coro.cpp" target="_top">http_server_coro.cpp</a>
 319                 </p>
 320               </td>
 321 <td>
 322                 <p>
 323                   <a href="../../../example/http/server/coro-ssl/http_server_coro_ssl.cpp" target="_top">http_server_coro_ssl.cpp</a>
 324                 </p>
 325               </td>
 326 </tr>
 327 <tr>
 328 <td>
 329                 <p>
 330                   HTTP, stackless coroutine
 331                 </p>
 332               </td>
 333 <td>
 334                 <p>
 335                   <a href="../../../example/http/server/stackless/http_server_stackless.cpp" target="_top">http_server_stackless.cpp</a>
 336                 </p>
 337               </td>
 338 <td>
 339                 <p>
 340                   <a href="../../../example/http/server/stackless-ssl/http_server_stackless_ssl.cpp" target="_top">http_server_stackless_ssl.cpp</a>
 341                 </p>
 342               </td>
 343 </tr>
 344 <tr>
 345 <td>
 346                 <p>
 347                   HTTP, fast (optimized for speed)
 348                 </p>
 349               </td>
 350 <td>
 351                 <p>
 352                   <a href="../../../example/http/server/fast/http_server_fast.cpp" target="_top">http_server_fast.cpp</a>
 353                 </p>
 354               </td>
 355 <td>
 356               </td>
 357 </tr>
 358 <tr>
 359 <td>
 360                 <p>
 361                   HTTP, small (optimized for space)
 362                 </p>
 363               </td>
 364 <td>
 365                 <p>
 366                   <a href="../../../example/http/server/small/http_server_small.cpp" target="_top">http_server_small.cpp</a>
 367                 </p>
 368               </td>
 369 <td>
 370               </td>
 371 </tr>
 372 <tr>
 373 <td>
 374                 <p>
 375                   HTTP, flex (plain + SSL)
 376                 </p>
 377               </td>
 378 <td>
 379               </td>
 380 <td>
 381                 <p>
 382                   <a href="../../../example/http/server/flex/http_server_flex.cpp" target="_top">http_server_flex.cpp</a>
 383                 </p>
 384               </td>
 385 </tr>
 386 </tbody>
 387 </table></div>
 388 <p>
 389         These WebSocket servers echo back any message received, keeping the session
 390         open until the client disconnects. All asynchronous servers support timeouts.
 391       </p>
 392 <div class="informaltable"><table class="table">
 393 <colgroup>
 394 <col>
 395 <col>
 396 <col>
 397 </colgroup>
 398 <thead><tr>
 399 <th>
 400                 <p>
 401                   Description
 402                 </p>
 403               </th>
 404 <th>
 405                 <p>
 406                   Source File
 407                 </p>
 408               </th>
 409 <th>
 410                 <p>
 411                   Source File (using SSL)
 412                 </p>
 413               </th>
 414 </tr></thead>
 415 <tbody>
 416 <tr>
 417 <td>
 418                 <p>
 419                   WebSocket, synchronous
 420                 </p>
 421               </td>
 422 <td>
 423                 <p>
 424                   <a href="../../../example/websocket/server/sync/websocket_server_sync.cpp" target="_top">websocket_server_sync.cpp</a>
 425                 </p>
 426               </td>
 427 <td>
 428                 <p>
 429                   <a href="../../../example/websocket/server/sync-ssl/websocket_server_sync_ssl.cpp" target="_top">websocket_server_sync_ssl.cpp</a>
 430                 </p>
 431               </td>
 432 </tr>
 433 <tr>
 434 <td>
 435                 <p>
 436                   WebSocket, asynchronous
 437                 </p>
 438               </td>
 439 <td>
 440                 <p>
 441                   <a href="../../../example/websocket/server/async/websocket_server_async.cpp" target="_top">websocket_server_async.cpp</a>
 442                 </p>
 443               </td>
 444 <td>
 445                 <p>
 446                   <a href="../../../example/websocket/server/async-ssl/websocket_server_async_ssl.cpp" target="_top">websocket_server_async_ssl.cpp</a>
 447                 </p>
 448               </td>
 449 </tr>
 450 <tr>
 451 <td>
 452                 <p>
 453                   WebSocket, coroutine
 454                 </p>
 455               </td>
 456 <td>
 457                 <p>
 458                   <a href="../../../example/websocket/server/coro/websocket_server_coro.cpp" target="_top">websocket_server_coro.cpp</a>
 459                 </p>
 460               </td>
 461 <td>
 462                 <p>
 463                   <a href="../../../example/websocket/server/coro-ssl/websocket_server_coro_ssl.cpp" target="_top">websocket_server_coro_ssl.cpp</a>
 464                 </p>
 465               </td>
 466 </tr>
 467 <tr>
 468 <td>
 469                 <p>
 470                   WebSocket, stackless coroutine
 471                 </p>
 472               </td>
 473 <td>
 474                 <p>
 475                   <a href="../../../example/websocket/server/stackless/websocket_server_stackless.cpp" target="_top">websocket_server_stackless.cpp</a>
 476                 </p>
 477               </td>
 478 <td>
 479                 <p>
 480                   <a href="../../../example/websocket/server/stackless-ssl/websocket_server_stackless_ssl.cpp" target="_top">websocket_server_stackless_ssl.cpp</a>
 481                 </p>
 482               </td>
 483 </tr>
 484 <tr>
 485 <td>
 486                 <p>
 487                   WebSocket, fast (suited for benchmarks)
 488                 </p>
 489               </td>
 490 <td>
 491                 <p>
 492                   <a href="../../../example/websocket/server/fast/websocket_server_fast.cpp" target="_top">websocket_server_fast.cpp</a>
 493                 </p>
 494               </td>
 495 <td>
 496               </td>
 497 </tr>
 498 </tbody>
 499 </table></div>
 500 </div>
 501 <div class="section">
 502 <div class="titlepage"><div><div><h3 class="title">
 503 <a name="beast.examples.servers_advanced"></a><a class="link" href="examples.html#beast.examples.servers_advanced" title="Servers (Advanced)">Servers (Advanced)</a>
 504 </h3></div></div></div>
 505 <p>
 506         These servers offer both HTTP and WebSocket services on the same port, and
 507         illustrate the implementation of advanced features.
 508       </p>
 509 <div class="informaltable"><table class="table">
 510 <colgroup>
 511 <col>
 512 <col>
 513 <col>
 514 </colgroup>
 515 <thead><tr>
 516 <th>
 517                 <p>
 518                   Description
 519                 </p>
 520               </th>
 521 <th>
 522                 <p>
 523                   Features
 524                 </p>
 525               </th>
 526 <th>
 527                 <p>
 528                   Sources
 529                 </p>
 530               </th>
 531 </tr></thead>
 532 <tbody>
 533 <tr>
 534 <td>
 535                 <p>
 536                   Advanced
 537                 </p>
 538               </td>
 539 <td>
 540                 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 541 <li class="listitem">
 542                       Timeouts
 543                     </li>
 544 <li class="listitem">
 545                       Multi-threaded
 546                     </li>
 547 <li class="listitem">
 548                       HTTP pipelining
 549                     </li>
 550 <li class="listitem">
 551                       Parser-oriented HTTP reading
 552                     </li>
 553 <li class="listitem">
 554                       Dual protocols: HTTP and WebSocket
 555                     </li>
 556 <li class="listitem">
 557                       Clean exit via SIGINT (CTRL+C) or SIGTERM (kill)
 558                     </li>
 559 </ul></div>
 560               </td>
 561 <td>
 562                 <p>
 563                   <a href="../../../example/advanced/server/advanced_server.cpp" target="_top">advanced_server.cpp</a>
 564                 </p>
 565               </td>
 566 </tr>
 567 <tr>
 568 <td>
 569                 <p>
 570                   Advanced, flex (plain + SSL)
 571                 </p>
 572               </td>
 573 <td>
 574                 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 575 <li class="listitem">
 576                       Timeouts
 577                     </li>
 578 <li class="listitem">
 579                       Multi-threaded
 580                     </li>
 581 <li class="listitem">
 582                       HTTP pipelining
 583                     </li>
 584 <li class="listitem">
 585                       Parser-oriented HTTP reading
 586                     </li>
 587 <li class="listitem">
 588                       Dual protocols: HTTP and WebSocket
 589                     </li>
 590 <li class="listitem">
 591                       Flexible ports: plain and SSL on the same port
 592                     </li>
 593 <li class="listitem">
 594                       Clean exit via SIGINT (CTRL+C) or SIGTERM (kill)
 595                     </li>
 596 </ul></div>
 597               </td>
 598 <td>
 599                 <p>
 600                   <a href="../../../example/advanced/server-flex/advanced_server_flex.cpp" target="_top">advanced_server_flex.cpp</a>
 601                 </p>
 602               </td>
 603 </tr>
 604 <tr>
 605 <td>
 606                 <p>
 607                   Chat Server, multi-threaded
 608                 </p>
 609               </td>
 610 <td>
 611                 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 612 <li class="listitem">
 613                       Multi-threaded
 614                     </li>
 615 <li class="listitem">
 616                       Broadcasting Messages
 617                     </li>
 618 <li class="listitem">
 619                       Multi-user Chat Server
 620                     </li>
 621 <li class="listitem">
 622                       JavaScript Browser Client
 623                     </li>
 624 <li class="listitem">
 625                       Parser-oriented HTTP reading
 626                     </li>
 627 <li class="listitem">
 628                       Dual protocols: HTTP and WebSocket
 629                     </li>
 630 <li class="listitem">
 631                       Clean exit via SIGINT (CTRL+C) or SIGTERM (kill)
 632                     </li>
 633 </ul></div>
 634               </td>
 635 <td>
 636                 <p>
 637                   <a href="../../../example/websocket/server/chat-multi" target="_top">chat-multi</a>
 638                 </p>
 639               </td>
 640 </tr>
 641 </tbody>
 642 </table></div>
 643 </div>
 644 <div class="section">
 645 <div class="titlepage"><div><div><h3 class="title">
 646 <a name="beast.examples.chat_server"></a><a class="link" href="examples.html#beast.examples.chat_server" title="Chat Server &#127910;">Chat Server &#127910;</a>
 647 </h3></div></div></div>
 648 <p>
 649         This example demonstrates a websocket chat server, allowing multiple users
 650         to connect and participate in live, group messaging. It comes with a tiny
 651         front end implemented in JavaScript and HTML5 which runs in any browser.
 652         The example is accompanied by a one hour presentation which provides a discussion
 653         of networking concepts, followed by in-depth explanation of how the client
 654         and server are constructed. This talk was delivered at <a href="https://cppcon.org" target="_top">CppCon
 655         2018</a>. The source code in the Beast example contains improvements
 656         to the original program.
 657       </p>
 658 <div class="table">
 659 <a name="beast.examples.chat_server.chat_websocket_server_and_javasc"></a><p class="title"><b>Table&#160;1.1.&#160;Chat WebSocket Server and JavaScript Client</b></p>
 660 <div class="table-contents"><table class="table" summary="Chat WebSocket Server and JavaScript Client">
 661 <colgroup>
 662 <col>
 663 <col>
 664 <col>
 665 </colgroup>
 666 <thead><tr>
 667 <th>
 668                 <p>
 669                   Component
 670                 </p>
 671               </th>
 672 <th>
 673                 <p>
 674                   Features
 675                 </p>
 676               </th>
 677 <th>
 678                 <p>
 679                   Sources
 680                 </p>
 681               </th>
 682 </tr></thead>
 683 <tbody>
 684 <tr>
 685 <td>
 686                 <p>
 687                   Server
 688                 </p>
 689               </td>
 690 <td>
 691                 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 692 <li class="listitem">
 693                       C++
 694                     </li>
 695 <li class="listitem">
 696                       Timeouts
 697                     </li>
 698 <li class="listitem">
 699                       Multi-threaded
 700                     </li>
 701 <li class="listitem">
 702                       Broadcast to multiple peers
 703                     </li>
 704 <li class="listitem">
 705                       Dual protocols: HTTP and WebSocket
 706                     </li>
 707 <li class="listitem">
 708                       Clean exit via SIGINT (CTRL+C) or SIGTERM (kill)
 709                     </li>
 710 </ul></div>
 711               </td>
 712 <td>
 713                 <p>
 714                   <a href="../../../example/websocket/server/chat-multi" target="_top">chat-multi</a>
 715                 </p>
 716               </td>
 717 </tr>
 718 <tr>
 719 <td>
 720                 <p>
 721                   Client
 722                 </p>
 723               </td>
 724 <td>
 725                 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 726 <li class="listitem">
 727                       JavaScript / HTML5
 728                     </li>
 729 <li class="listitem">
 730                       Runs in the browser
 731                     </li>
 732 <li class="listitem">
 733                       Delivered by the server
 734                     </li>
 735 <li class="listitem">
 736                       Only 60 lines total including UI
 737                     </li>
 738 <li class="listitem">
 739                       Completely portable graphics
 740                     </li>
 741 </ul></div>
 742               </td>
 743 <td>
 744                 <p>
 745                   <a href="../../../example/websocket/server/chat-multi/chat_client.html" target="_top">chat_client.html</a>
 746                 </p>
 747               </td>
 748 </tr>
 749 </tbody>
 750 </table></div>
 751 </div>
 752 <br class="table-break"><p>
 753         </p>
 754 <div class="mediaobject"><embed src="https://www.youtube.com/embed/7FQwAjELMek" align="middle" width="560" height="315"></embed></div>
 755 <p>
 756       </p>
 757 </div>
 758 </div>
 759 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 760 <td align="left"></td>
 761 <td align="right"><div class="copyright-footer">Copyright &#169; 2016-2019 Vinnie
 762       Falco<p>
 763         Distributed under the Boost Software License, Version 1.0. (See accompanying
 764         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
 765       </p>
 766 </div></td>
 767 </tr></table>
 768 <hr>
 769 <div class="spirit-nav">
 770 <a accesskey="p" href="quick_start/websocket_autobahn_testsuite.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="using_io.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
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