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  62. <div id="doc-content">
    63. 

  63. <div class="header">
    64. 

  64.   <div class="summary">
    65. 

  65. <a href="#func-members">Functions</a>  </div>
    66. 

  66.   <div class="headertitle">
    67. 

  67. <div class="title">HTTP headers: create<div class="ingroups"><a class="el" href="group__http.html">HTTP</a></div></div>  </div>
    68. 

  68. </div><!--header-->
    69. 

  69. <div class="contents">
    70. 

  70. <table class="memberdecls">
    71. 

  71. <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
    72. 

  72. Functions</h2></td></tr>
    73. 

  73. <tr class="memitem:ga29b7d6d2ddfdbaff3d8b607e7e3151b6"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__HTTP-headers-create.html#ga29b7d6d2ddfdbaff3d8b607e7e3151b6">lws_add_http_header_status</a> (struct lws *wsi, unsigned int code, unsigned char **p, unsigned char *end)</td></tr>
    74. 

  74. <tr class="separator:ga29b7d6d2ddfdbaff3d8b607e7e3151b6"><td class="memSeparator" colspan="2">&#160;</td></tr>
    75. 

  75. <tr class="memitem:ga2b36bf44405755ff51c1939303b995a8"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__HTTP-headers-create.html#ga2b36bf44405755ff51c1939303b995a8">lws_add_http_header_by_name</a> (struct lws *wsi, const unsigned char *name, const unsigned char *value, int length, unsigned char **p, unsigned char *end)</td></tr>
    76. 

  76. <tr class="separator:ga2b36bf44405755ff51c1939303b995a8"><td class="memSeparator" colspan="2">&#160;</td></tr>
    77. 

  77. <tr class="memitem:gaf74adb761b22566ad70004882712dce1"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__HTTP-headers-create.html#gaf74adb761b22566ad70004882712dce1">lws_add_http_header_by_token</a> (struct lws *wsi, enum lws_token_indexes token, const unsigned char *value, int length, unsigned char **p, unsigned char *end)</td></tr>
    78. 

  78. <tr class="separator:gaf74adb761b22566ad70004882712dce1"><td class="memSeparator" colspan="2">&#160;</td></tr>
    79. 

  79. <tr class="memitem:gacc76a5babcb4dce1b01b1955aa7a2faf"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__HTTP-headers-create.html#gacc76a5babcb4dce1b01b1955aa7a2faf">lws_add_http_header_content_length</a> (struct lws *wsi, unsigned long content_length, unsigned char **p, unsigned char *end)</td></tr>
    80. 

  80. <tr class="separator:gacc76a5babcb4dce1b01b1955aa7a2faf"><td class="memSeparator" colspan="2">&#160;</td></tr>
    81. 

  81. <tr class="memitem:ga4887605ff2242a54db3a7fa01f6f864b"><td class="memItemLeft" align="right" valign="top">LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__HTTP-headers-create.html#ga4887605ff2242a54db3a7fa01f6f864b">lws_finalize_http_header</a> (struct lws *wsi, unsigned char **p, unsigned char *end)</td></tr>
    82. 

  82. <tr class="separator:ga4887605ff2242a54db3a7fa01f6f864b"><td class="memSeparator" colspan="2">&#160;</td></tr>
    83. 

  83. </table>
    84. 

  84. <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
    85. 

  85. <h2>HTTP headers: Create</h2>
    86. 

  86. <p>These apis allow you to create HTTP response headers in a way compatible with both HTTP/1.x and HTTP/2.</p>
    87. 

  87. <p>They each append to a buffer taking care about the buffer end, which is passed in as a pointer. When data is written to the buffer, the current position p is updated accordingly.</p>
    88. 

  88. <p>All of these apis are LWS_WARN_UNUSED_RESULT as they can run out of space and fail with nonzero return. </p>
    89. 

  89. <h2 class="groupheader">Function Documentation</h2>
    90. 

  90. <a class="anchor" id="ga2b36bf44405755ff51c1939303b995a8"></a>
    91. 

  91. <div class="memitem">
    92. 

  92. <div class="memproto">
    93. 

  93.       <table class="memname">
    94. 

  94.         <tr>
    95. 

  95.           <td class="memname">LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT lws_add_http_header_by_name </td>
    96. 

  96.           <td>(</td>
    97. 

  97.           <td class="paramtype">struct lws *&#160;</td>
    98. 

  98.           <td class="paramname"><em>wsi</em>, </td>
    99. 

  99.         </tr>
    100. 

  100.         <tr>
    101. 

  101.           <td class="paramkey"></td>
    102. 

  102.           <td></td>
    103. 

  103.           <td class="paramtype">const unsigned char *&#160;</td>
    104. 

  104.           <td class="paramname"><em>name</em>, </td>
    105. 

  105.         </tr>
    106. 

  106.         <tr>
    107. 

  107.           <td class="paramkey"></td>
    108. 

  108.           <td></td>
    109. 

  109.           <td class="paramtype">const unsigned char *&#160;</td>
    110. 

  110.           <td class="paramname"><em>value</em>, </td>
    111. 

  111.         </tr>
    112. 

  112.         <tr>
    113. 

  113.           <td class="paramkey"></td>
    114. 

  114.           <td></td>
    115. 

  115.           <td class="paramtype">int&#160;</td>
    116. 

  116.           <td class="paramname"><em>length</em>, </td>
    117. 

  117.         </tr>
    118. 

  118.         <tr>
    119. 

  119.           <td class="paramkey"></td>
    120. 

  120.           <td></td>
    121. 

  121.           <td class="paramtype">unsigned char **&#160;</td>
    122. 

  122.           <td class="paramname"><em>p</em>, </td>
    123. 

  123.         </tr>
    124. 

  124.         <tr>
    125. 

  125.           <td class="paramkey"></td>
    126. 

  126.           <td></td>
    127. 

  127.           <td class="paramtype">unsigned char *&#160;</td>
    128. 

  128.           <td class="paramname"><em>end</em>&#160;</td>
    129. 

  129.         </tr>
    130. 

  130.         <tr>
    131. 

  131.           <td></td>
    132. 

  132.           <td>)</td>
    133. 

  133.           <td></td><td></td>
    134. 

  134.         </tr>
    135. 

  135.       </table>
    136. 

  136. </div><div class="memdoc">
    137. 

  137. 

  138. <p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
    139. 

  139. <p><a class="el" href="group__HTTP-headers-create.html#ga2b36bf44405755ff51c1939303b995a8">lws_add_http_header_by_name()</a> - append named header and value</p>
    140. 

  140. <dl class="params"><dt>Parameters</dt><dd>
    141. 

  141.   <table class="params">
    142. 

  142.     <tr><td class="paramname">wsi</td><td>the connection to check </td></tr>
    143. 

  143.     <tr><td class="paramname">name</td><td>the hdr name, like "my-header" </td></tr>
    144. 

  144.     <tr><td class="paramname">value</td><td>the value after the = for this header </td></tr>
    145. 

  145.     <tr><td class="paramname">length</td><td>the length of the value </td></tr>
    146. 

  146.     <tr><td class="paramname">p</td><td>pointer to current position in buffer pointer </td></tr>
    147. 

  147.     <tr><td class="paramname">end</td><td>pointer to end of buffer</td></tr>
    148. 

  148.   </table>
    149. 

  149.   </dd>
    150. 

  150. </dl>
    151. 

  151. <p>Appends name: value to the headers </p>
    152. 

  152. 

  153. </div>
    154. 

  154. </div>
    155. 

  155. <a class="anchor" id="gaf74adb761b22566ad70004882712dce1"></a>
    156. 

  156. <div class="memitem">
    157. 

  157. <div class="memproto">
    158. 

  158.       <table class="memname">
    159. 

  159.         <tr>
    160. 

  160.           <td class="memname">LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT lws_add_http_header_by_token </td>
    161. 

  161.           <td>(</td>
    162. 

  162.           <td class="paramtype">struct lws *&#160;</td>
    163. 

  163.           <td class="paramname"><em>wsi</em>, </td>
    164. 

  164.         </tr>
    165. 

  165.         <tr>
    166. 

  166.           <td class="paramkey"></td>
    167. 

  167.           <td></td>
    168. 

  168.           <td class="paramtype">enum lws_token_indexes&#160;</td>
    169. 

  169.           <td class="paramname"><em>token</em>, </td>
    170. 

  170.         </tr>
    171. 

  171.         <tr>
    172. 

  172.           <td class="paramkey"></td>
    173. 

  173.           <td></td>
    174. 

  174.           <td class="paramtype">const unsigned char *&#160;</td>
    175. 

  175.           <td class="paramname"><em>value</em>, </td>
    176. 

  176.         </tr>
    177. 

  177.         <tr>
    178. 

  178.           <td class="paramkey"></td>
    179. 

  179.           <td></td>
    180. 

  180.           <td class="paramtype">int&#160;</td>
    181. 

  181.           <td class="paramname"><em>length</em>, </td>
    182. 

  182.         </tr>
    183. 

  183.         <tr>
    184. 

  184.           <td class="paramkey"></td>
    185. 

  185.           <td></td>
    186. 

  186.           <td class="paramtype">unsigned char **&#160;</td>
    187. 

  187.           <td class="paramname"><em>p</em>, </td>
    188. 

  188.         </tr>
    189. 

  189.         <tr>
    190. 

  190.           <td class="paramkey"></td>
    191. 

  191.           <td></td>
    192. 

  192.           <td class="paramtype">unsigned char *&#160;</td>
    193. 

  193.           <td class="paramname"><em>end</em>&#160;</td>
    194. 

  194.         </tr>
    195. 

  195.         <tr>
    196. 

  196.           <td></td>
    197. 

  197.           <td>)</td>
    198. 

  198.           <td></td><td></td>
    199. 

  199.         </tr>
    200. 

  200.       </table>
    201. 

  201. </div><div class="memdoc">
    202. 

  202. 

  203. <p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
    204. 

  204. <p><a class="el" href="group__HTTP-headers-create.html#gaf74adb761b22566ad70004882712dce1">lws_add_http_header_by_token()</a> - append given header and value</p>
    205. 

  205. <dl class="params"><dt>Parameters</dt><dd>
    206. 

  206.   <table class="params">
    207. 

  207.     <tr><td class="paramname">wsi</td><td>the connection to check </td></tr>
    208. 

  208.     <tr><td class="paramname">token</td><td>the token index for the hdr </td></tr>
    209. 

  209.     <tr><td class="paramname">value</td><td>the value after the = for this header </td></tr>
    210. 

  210.     <tr><td class="paramname">length</td><td>the length of the value </td></tr>
    211. 

  211.     <tr><td class="paramname">p</td><td>pointer to current position in buffer pointer </td></tr>
    212. 

  212.     <tr><td class="paramname">end</td><td>pointer to end of buffer</td></tr>
    213. 

  213.   </table>
    214. 

  214.   </dd>
    215. 

  215. </dl>
    216. 

  216. <p>Appends name=value to the headers, but is able to take advantage of better HTTP/2 coding mechanisms where possible. </p>
    217. 

  217. 

  218. </div>
    219. 

  219. </div>
    220. 

  220. <a class="anchor" id="gacc76a5babcb4dce1b01b1955aa7a2faf"></a>
    221. 

  221. <div class="memitem">
    222. 

  222. <div class="memproto">
    223. 

  223.       <table class="memname">
    224. 

  224.         <tr>
    225. 

  225.           <td class="memname">LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT lws_add_http_header_content_length </td>
    226. 

  226.           <td>(</td>
    227. 

  227.           <td class="paramtype">struct lws *&#160;</td>
    228. 

  228.           <td class="paramname"><em>wsi</em>, </td>
    229. 

  229.         </tr>
    230. 

  230.         <tr>
    231. 

  231.           <td class="paramkey"></td>
    232. 

  232.           <td></td>
    233. 

  233.           <td class="paramtype">unsigned long&#160;</td>
    234. 

  234.           <td class="paramname"><em>content_length</em>, </td>
    235. 

  235.         </tr>
    236. 

  236.         <tr>
    237. 

  237.           <td class="paramkey"></td>
    238. 

  238.           <td></td>
    239. 

  239.           <td class="paramtype">unsigned char **&#160;</td>
    240. 

  240.           <td class="paramname"><em>p</em>, </td>
    241. 

  241.         </tr>
    242. 

  242.         <tr>
    243. 

  243.           <td class="paramkey"></td>
    244. 

  244.           <td></td>
    245. 

  245.           <td class="paramtype">unsigned char *&#160;</td>
    246. 

  246.           <td class="paramname"><em>end</em>&#160;</td>
    247. 

  247.         </tr>
    248. 

  248.         <tr>
    249. 

  249.           <td></td>
    250. 

  250.           <td>)</td>
    251. 

  251.           <td></td><td></td>
    252. 

  252.         </tr>
    253. 

  253.       </table>
    254. 

  254. </div><div class="memdoc">
    255. 

  255. 

  256. <p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
    257. 

  257. <p><a class="el" href="group__HTTP-headers-create.html#ga2b36bf44405755ff51c1939303b995a8">lws_add_http_header_by_name()</a> - append content-length helper</p>
    258. 

  258. <dl class="params"><dt>Parameters</dt><dd>
    259. 

  259.   <table class="params">
    260. 

  260.     <tr><td class="paramname">wsi</td><td>the connection to check </td></tr>
    261. 

  261.     <tr><td class="paramname">content_length</td><td>the content length to use </td></tr>
    262. 

  262.     <tr><td class="paramname">p</td><td>pointer to current position in buffer pointer </td></tr>
    263. 

  263.     <tr><td class="paramname">end</td><td>pointer to end of buffer</td></tr>
    264. 

  264.   </table>
    265. 

  265.   </dd>
    266. 

  266. </dl>
    267. 

  267. <p>Appends content-length: content_length to the headers </p>
    268. 

  268. 

  269. </div>
    270. 

  270. </div>
    271. 

  271. <a class="anchor" id="ga29b7d6d2ddfdbaff3d8b607e7e3151b6"></a>
    272. 

  272. <div class="memitem">
    273. 

  273. <div class="memproto">
    274. 

  274.       <table class="memname">
    275. 

  275.         <tr>
    276. 

  276.           <td class="memname">LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT lws_add_http_header_status </td>
    277. 

  277.           <td>(</td>
    278. 

  278.           <td class="paramtype">struct lws *&#160;</td>
    279. 

  279.           <td class="paramname"><em>wsi</em>, </td>
    280. 

  280.         </tr>
    281. 

  281.         <tr>
    282. 

  282.           <td class="paramkey"></td>
    283. 

  283.           <td></td>
    284. 

  284.           <td class="paramtype">unsigned int&#160;</td>
    285. 

  285.           <td class="paramname"><em>code</em>, </td>
    286. 

  286.         </tr>
    287. 

  287.         <tr>
    288. 

  288.           <td class="paramkey"></td>
    289. 

  289.           <td></td>
    290. 

  290.           <td class="paramtype">unsigned char **&#160;</td>
    291. 

  291.           <td class="paramname"><em>p</em>, </td>
    292. 

  292.         </tr>
    293. 

  293.         <tr>
    294. 

  294.           <td class="paramkey"></td>
    295. 

  295.           <td></td>
    296. 

  296.           <td class="paramtype">unsigned char *&#160;</td>
    297. 

  297.           <td class="paramname"><em>end</em>&#160;</td>
    298. 

  298.         </tr>
    299. 

  299.         <tr>
    300. 

  300.           <td></td>
    301. 

  301.           <td>)</td>
    302. 

  302.           <td></td><td></td>
    303. 

  303.         </tr>
    304. 

  304.       </table>
    305. 

  305. </div><div class="memdoc">
    306. 

  306. 

  307. <p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
    308. 

  308. <p><a class="el" href="group__HTTP-headers-create.html#ga29b7d6d2ddfdbaff3d8b607e7e3151b6">lws_add_http_header_status()</a> - add the HTTP response status code</p>
    309. 

  309. <dl class="params"><dt>Parameters</dt><dd>
    310. 

  310.   <table class="params">
    311. 

  311.     <tr><td class="paramname">wsi</td><td>the connection to check </td></tr>
    312. 

  312.     <tr><td class="paramname">code</td><td>an HTTP code like 200, 404 etc (see enum http_status) </td></tr>
    313. 

  313.     <tr><td class="paramname">p</td><td>pointer to current position in buffer pointer </td></tr>
    314. 

  314.     <tr><td class="paramname">end</td><td>pointer to end of buffer</td></tr>
    315. 

  315.   </table>
    316. 

  316.   </dd>
    317. 

  317. </dl>
    318. 

  318. <p>Adds the initial response code, so should be called first </p>
    319. 

  319. 

  320. </div>
    321. 

  321. </div>
    322. 

  322. <a class="anchor" id="ga4887605ff2242a54db3a7fa01f6f864b"></a>
    323. 

  323. <div class="memitem">
    324. 

  324. <div class="memproto">
    325. 

  325.       <table class="memname">
    326. 

  326.         <tr>
    327. 

  327.           <td class="memname">LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT lws_finalize_http_header </td>
    328. 

  328.           <td>(</td>
    329. 

  329.           <td class="paramtype">struct lws *&#160;</td>
    330. 

  330.           <td class="paramname"><em>wsi</em>, </td>
    331. 

  331.         </tr>
    332. 

  332.         <tr>
    333. 

  333.           <td class="paramkey"></td>
    334. 

  334.           <td></td>
    335. 

  335.           <td class="paramtype">unsigned char **&#160;</td>
    336. 

  336.           <td class="paramname"><em>p</em>, </td>
    337. 

  337.         </tr>
    338. 

  338.         <tr>
    339. 

  339.           <td class="paramkey"></td>
    340. 

  340.           <td></td>
    341. 

  341.           <td class="paramtype">unsigned char *&#160;</td>
    342. 

  342.           <td class="paramname"><em>end</em>&#160;</td>
    343. 

  343.         </tr>
    344. 

  344.         <tr>
    345. 

  345.           <td></td>
    346. 

  346.           <td>)</td>
    347. 

  347.           <td></td><td></td>
    348. 

  348.         </tr>
    349. 

  349.       </table>
    350. 

  350. </div><div class="memdoc">
    351. 

  351. 

  352. <p><code>#include &lt;<a class="el" href="libwebsockets_8h.html">lib/libwebsockets.h</a>&gt;</code></p>
    353. 

  353. <p><a class="el" href="group__HTTP-headers-create.html#ga4887605ff2242a54db3a7fa01f6f864b">lws_finalize_http_header()</a> - terminate header block</p>
    354. 

  354. <dl class="params"><dt>Parameters</dt><dd>
    355. 

  355.   <table class="params">
    356. 

  356.     <tr><td class="paramname">wsi</td><td>the connection to check </td></tr>
    357. 

  357.     <tr><td class="paramname">p</td><td>pointer to current position in buffer pointer </td></tr>
    358. 

  358.     <tr><td class="paramname">end</td><td>pointer to end of buffer</td></tr>
    359. 

  359.   </table>
    360. 

  360.   </dd>
    361. 

  361. </dl>
    362. 

  362. <p>Indicates no more headers will be added </p>
    363. 

  363. 

  364. </div>
    365. 

  365. </div>
    366. 

  366. </div><!-- contents -->
    367. 

  367. </div><!-- doc-content -->
    368. 

  368. <!-- start footer part -->
    369. 

  369. <div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
    370. 

  370.   <ul>
    371. 

  371.     <li class="footer">Generated by
    372. 

  372.     <a href="http://www.doxygen.org/index.html">
    373. 

  373.     <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.11 </li>
    374. 

  374.   </ul>
    375. 

  375. </div>
    376. 

  376. </body>
    377. 

  377. </html>
    378.