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https://github.com/nasa/trick.git
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584 lines
24 KiB
HTML
584 lines
24 KiB
HTML
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>Extending_the_HTTP-API</title>
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<style type="text/css">
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body {
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font-family: Helvetica, arial, sans-serif;
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font-size: 14px;
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line-height: 1.6;
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padding-top: 10px;
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padding-bottom: 10px;
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background-color: white;
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padding: 30px; }
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body > *:first-child {
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margin-top: 0 !important; }
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body > *:last-child {
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margin-bottom: 0 !important; }
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a {
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color: #4183C4; }
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a.absent {
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color: #cc0000; }
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a.anchor {
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display: block;
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padding-left: 30px;
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margin-left: -30px;
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cursor: pointer;
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position: absolute;
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top: 0;
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left: 0;
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bottom: 0; }
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h1, h2, h3, h4, h5, h6 {
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margin: 20px 0 10px;
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padding: 0;
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font-weight: bold;
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-webkit-font-smoothing: antialiased;
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cursor: text;
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position: relative; }
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h1:hover a.anchor, h2:hover a.anchor, h3:hover a.anchor, h4:hover a.anchor, h5:hover a.anchor, h6:hover a.anchor {
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text-decoration: none; }
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h1 tt, h1 code {
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h3 tt, h3 code {
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h6 tt, h6 code {
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h1 {
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font-size: 28px;
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h2 {
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font-size: 24px;
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border-bottom: 1px solid #cccccc;
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color: black; }
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h3 {
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font-size: 18px; }
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h4 {
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font-size: 16px; }
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h5 {
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font-size: 14px; }
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h6 {
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color: #777777;
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font-size: 14px; }
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p, blockquote, ul, ol, dl, li, table, pre {
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margin: 15px 0; }
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hr {
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border: 0 none;
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color: #cccccc;
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height: 4px;
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padding: 0;
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}
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body > h2:first-child {
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margin-top: 0;
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padding-top: 0; }
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body > h1:first-child {
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margin-top: 0;
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padding-top: 0; }
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body > h1:first-child + h2 {
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margin-top: 0;
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padding-top: 0; }
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body > h3:first-child, body > h4:first-child, body > h5:first-child, body > h6:first-child {
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margin-top: 0;
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padding-top: 0; }
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a:first-child h1, a:first-child h2, a:first-child h3, a:first-child h4, a:first-child h5, a:first-child h6 {
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margin-top: 0;
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padding-top: 0; }
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h1 p, h2 p, h3 p, h4 p, h5 p, h6 p {
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margin-top: 0; }
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li p.first {
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display: inline-block; }
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li {
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margin: 0; }
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ul, ol {
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padding-left: 30px; }
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ul :first-child, ol :first-child {
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margin-top: 0; }
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dl {
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padding: 0; }
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dl dt {
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font-size: 14px;
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font-weight: bold;
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font-style: italic;
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padding: 0;
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margin: 15px 0 5px; }
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dl dt:first-child {
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padding: 0; }
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dl dt > :first-child {
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margin-top: 0; }
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dl dt > :last-child {
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margin-bottom: 0; }
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dl dd {
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margin: 0 0 15px;
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padding: 0 15px; }
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dl dd > :first-child {
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margin-top: 0; }
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dl dd > :last-child {
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margin-bottom: 0; }
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blockquote {
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border-left: 4px solid #dddddd;
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padding: 0 15px;
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color: #777777; }
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blockquote > :first-child {
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margin-top: 0; }
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blockquote > :last-child {
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margin-bottom: 0; }
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table {
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padding: 0;border-collapse: collapse; }
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table tr {
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border-top: 1px solid #cccccc;
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background-color: white;
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margin: 0;
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padding: 0; }
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table tr:nth-child(2n) {
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background-color: #f8f8f8; }
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table tr th {
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font-weight: bold;
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border: 1px solid #cccccc;
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margin: 0;
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padding: 6px 13px; }
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table tr td {
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border: 1px solid #cccccc;
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margin: 0;
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padding: 6px 13px; }
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table tr th :first-child, table tr td :first-child {
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margin-top: 0; }
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table tr th :last-child, table tr td :last-child {
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margin-bottom: 0; }
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img {
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max-width: 100%; }
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span.frame {
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display: block;
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overflow: hidden; }
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span.frame > span {
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border: 1px solid #dddddd;
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display: block;
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float: left;
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overflow: hidden;
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margin: 13px 0 0;
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padding: 7px;
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width: auto; }
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span.frame span img {
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display: block;
|
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float: left; }
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span.frame span span {
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clear: both;
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color: #333333;
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display: block;
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padding: 5px 0 0; }
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span.align-center {
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display: block;
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overflow: hidden;
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|
clear: both; }
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span.align-center > span {
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display: block;
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overflow: hidden;
|
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margin: 13px auto 0;
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text-align: center; }
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span.align-center span img {
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margin: 0 auto;
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text-align: center; }
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span.align-right {
|
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display: block;
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overflow: hidden;
|
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clear: both; }
|
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span.align-right > span {
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display: block;
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overflow: hidden;
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margin: 13px 0 0;
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text-align: right; }
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span.align-right span img {
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margin: 0;
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text-align: right; }
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span.float-left {
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display: block;
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margin-right: 13px;
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overflow: hidden;
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float: left; }
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span.float-left span {
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margin: 13px 0 0; }
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span.float-right {
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display: block;
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margin-left: 13px;
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overflow: hidden;
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float: right; }
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span.float-right > span {
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display: block;
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overflow: hidden;
|
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margin: 13px auto 0;
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text-align: right; }
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|
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code, tt {
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margin: 0 2px;
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padding: 0 5px;
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|
white-space: nowrap;
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|
border: 1px solid #eaeaea;
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background-color: #f8f8f8;
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border-radius: 3px; }
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pre code {
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margin: 0;
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padding: 0;
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white-space: pre;
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border: none;
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background: transparent; }
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.highlight pre {
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background-color: #f8f8f8;
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|
border: 1px solid #cccccc;
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font-size: 13px;
|
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|
line-height: 19px;
|
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overflow: auto;
|
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padding: 6px 10px;
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border-radius: 3px; }
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pre {
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|
background-color: #f8f8f8;
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|
border: 1px solid #cccccc;
|
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|
font-size: 13px;
|
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|
line-height: 19px;
|
||
|
overflow: auto;
|
||
|
padding: 6px 10px;
|
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|
border-radius: 3px; }
|
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|
pre code, pre tt {
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|
background-color: transparent;
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|
border: none; }
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|
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|
sup {
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|
font-size: 0.83em;
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|
vertical-align: super;
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|
line-height: 0;
|
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|
}
|
||
|
* {
|
||
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-webkit-print-color-adjust: exact;
|
||
|
}
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||
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@media screen and (min-width: 914px) {
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||
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body {
|
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width: 854px;
|
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margin:0 auto;
|
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|
}
|
||
|
}
|
||
|
@media print {
|
||
|
table, pre {
|
||
|
page-break-inside: avoid;
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||
|
}
|
||
|
pre {
|
||
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word-wrap: break-word;
|
||
|
}
|
||
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}
|
||
|
</style>
|
||
|
|
||
|
<style type="text/css">
|
||
|
/**
|
||
|
* prism.js default theme for JavaScript, CSS and HTML
|
||
|
* Based on dabblet (http://dabblet.com)
|
||
|
* @author Lea Verou
|
||
|
*/
|
||
|
|
||
|
code[class*="language-"],
|
||
|
pre[class*="language-"] {
|
||
|
color: black;
|
||
|
background: none;
|
||
|
text-shadow: 0 1px white;
|
||
|
font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
|
||
|
text-align: left;
|
||
|
white-space: pre;
|
||
|
word-spacing: normal;
|
||
|
word-break: normal;
|
||
|
word-wrap: normal;
|
||
|
line-height: 1.5;
|
||
|
|
||
|
-moz-tab-size: 4;
|
||
|
-o-tab-size: 4;
|
||
|
tab-size: 4;
|
||
|
|
||
|
-webkit-hyphens: none;
|
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|
-moz-hyphens: none;
|
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|
-ms-hyphens: none;
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|
hyphens: none;
|
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|
}
|
||
|
|
||
|
pre[class*="language-"]::-moz-selection, pre[class*="language-"] ::-moz-selection,
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|
code[class*="language-"]::-moz-selection, code[class*="language-"] ::-moz-selection {
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|
text-shadow: none;
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|
background: #b3d4fc;
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|
}
|
||
|
|
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|
pre[class*="language-"]::selection, pre[class*="language-"] ::selection,
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|
code[class*="language-"]::selection, code[class*="language-"] ::selection {
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|
text-shadow: none;
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|
background: #b3d4fc;
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||
|
}
|
||
|
|
||
|
@media print {
|
||
|
code[class*="language-"],
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||
|
pre[class*="language-"] {
|
||
|
text-shadow: none;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* Code blocks */
|
||
|
pre[class*="language-"] {
|
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|
padding: 1em;
|
||
|
margin: .5em 0;
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overflow: auto;
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}
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:not(pre) > code[class*="language-"],
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pre[class*="language-"] {
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background: #f5f2f0;
|
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|
}
|
||
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|
||
|
/* Inline code */
|
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|
:not(pre) > code[class*="language-"] {
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padding: .1em;
|
||
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border-radius: .3em;
|
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white-space: normal;
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}
|
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.token.comment,
|
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.token.prolog,
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color: slategray;
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}
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.namespace {
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opacity: .7;
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}
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.token.property,
|
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.token.tag,
|
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.token.boolean,
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.token.number,
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.token.constant,
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.token.symbol,
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.token.deleted {
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color: #905;
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}
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.token.selector,
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.token.attr-name,
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.token.string,
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.token.char,
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.token.builtin,
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.token.inserted {
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color: #690;
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}
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.token.operator,
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.token.entity,
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.token.url,
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.language-css .token.string,
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.style .token.string {
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color: #a67f59;
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background: hsla(0, 0%, 100%, .5);
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}
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color: #07a;
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}
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color: #DD4A68;
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.token.regex,
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.token.important,
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color: #e90;
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cursor: help;
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}
|
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</style>
|
||
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||
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|
||
|
</head>
|
||
|
|
||
|
<body>
|
||
|
|
||
|
<h2 id="toc_0">Extending the HTTP-API</h2>
|
||
|
|
||
|
<p>The HTTP-API is implemented as a collection of <code>httpMethodHandlers</code>. An <code>httpMethodHandler</code> is a pointer to a function that is expected to respond to an HTTP GET request, using the <strong>Cesanta Mongoose</strong> framework. An <code>httpMethodHandler</code> is defined (in <code>trick/WebServer.hh</code>) as follows:</p>
|
||
|
|
||
|
<div><pre><code class="language-c">typedef void (*httpMethodHandler)(struct mg_connection*, struct http_message*);</code></pre></div>
|
||
|
|
||
|
<p>Documentation for the <strong>Cesanta Mongoose Networking Library</strong> can be found at:
|
||
|
<a href="https://cesanta.com/docs/overview/intro.html">https://cesanta.com/docs/overview/intro.html</a></p>
|
||
|
|
||
|
<h2 id="toc_1">Example HTTP-API Extension</h2>
|
||
|
|
||
|
<p>Suppose you want your web server to send you a JSON message: </p>
|
||
|
|
||
|
<div><pre><code class="language-javascript">{ "greeting" : "Hello Trick Sim Developer!" }</code></pre></div>
|
||
|
|
||
|
<p>when you invoke the URL: <code>http://localhost:8888/api/http/hello</code>.</p>
|
||
|
|
||
|
<h3 id="toc_2">Creating an <code>httpMethodHandler</code>.</h3>
|
||
|
|
||
|
<p>The following two files will be our implementation of an <code>httpMethodHandler</code>. We'll put these in some models directory <code>httpMethods/</code>.</p>
|
||
|
|
||
|
<p><strong><code>handle_HTTP_GET_hello.h</code></strong></p>
|
||
|
|
||
|
<div><pre><code class="language-c">#ifndef HANDLE_HTTP_GET_HELLO
|
||
|
#define HANDLE_HTTP_GET_HELLO
|
||
|
|
||
|
#ifndef SWIG
|
||
|
void handle_HTTP_GET_hello(struct mg_connection *nc, struct http_message *hm);
|
||
|
#endif
|
||
|
|
||
|
#endif</code></pre></div>
|
||
|
|
||
|
<p><strong><code>handle_HTTP_GET_hello.c</code></strong></p>
|
||
|
|
||
|
<div><pre><code class="language-c">#include "mongoose/mongoose.h"
|
||
|
|
||
|
void handle_HTTP_GET_hello(struct mg_connection *nc, struct http_message *hm) {
|
||
|
mg_printf(nc, "%s", "HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n");
|
||
|
const char* json_text =
|
||
|
"{ \"greeting\" : \"Hello Trick Sim Developer!\" }";
|
||
|
mg_printf_http_chunk(nc, "%s", json_text);
|
||
|
mg_send_http_chunk(nc, "", 0);
|
||
|
}</code></pre></div>
|
||
|
|
||
|
<h3 id="toc_3">Installing our <code>httpMethodHandler</code>.</h3>
|
||
|
|
||
|
<p>We'll do this from our <strong>S_define</strong> file:</p>
|
||
|
|
||
|
<ul>
|
||
|
<li><p>Add <code>(httpMethods/handle_HTTP_GET_hello.c)</code> to the <code>LIBRARY DEPENDENCIES</code>.</p></li>
|
||
|
<li><p>Include our header file:</p>
|
||
|
|
||
|
<p><code>##include "httpMethods/handle_HTTP_GET_hello.h"</code></p></li>
|
||
|
</ul>
|
||
|
|
||
|
<ul>
|
||
|
<li>In <code>create_connections()</code> add :</li>
|
||
|
</ul>
|
||
|
|
||
|
<div><pre><code class="language-c">web.server.installHTTPGEThandler( "hello", &handle_HTTP_GET_hello );</code></pre></div>
|
||
|
|
||
|
<h3 id="toc_4">A Complete S_define</h3>
|
||
|
|
||
|
<div><pre><code class="language-cpp">/***********************TRICK HEADER*************************
|
||
|
PURPOSE:
|
||
|
(Cannon Numeric)
|
||
|
LIBRARY DEPENDENCIES:
|
||
|
(
|
||
|
(cannon/gravity/src/cannon_init.c)
|
||
|
(cannon/gravity/src/cannon_numeric.c)
|
||
|
(httpMethods/handle_HTTP_GET_hello.c)
|
||
|
)
|
||
|
*************************************************************/
|
||
|
|
||
|
#include "sim_objects/default_trick_sys.sm"
|
||
|
#include "sim_objects/WebServer.sm"
|
||
|
##include "cannon/gravity/include/cannon_numeric.h"
|
||
|
##include "httpMethods/handle_HTTP_GET_hello.h"
|
||
|
|
||
|
class CannonSimObject : public Trick::SimObject {
|
||
|
|
||
|
public:
|
||
|
CANNON cannon ;
|
||
|
int foo;
|
||
|
CannonSimObject() {
|
||
|
("default_data") cannon_default_data( &cannon ) ;
|
||
|
("initialization") cannon_init( &cannon ) ;
|
||
|
("derivative") cannon_deriv( &cannon ) ;
|
||
|
("integration") trick_ret = cannon_integ( &cannon ) ;
|
||
|
("dynamic_event") cannon_impact( &cannon) ;
|
||
|
}
|
||
|
} ;
|
||
|
CannonSimObject dyn ;
|
||
|
|
||
|
IntegLoop dyn_integloop (0.01) dyn;
|
||
|
|
||
|
void create_connections() {
|
||
|
dyn_integloop.getIntegrator(Runge_Kutta_4, 5);
|
||
|
web.server.installHTTPGEThandler( "hello", &handle_HTTP_GET_hello );
|
||
|
}
|
||
|
</code></pre></div>
|
||
|
|
||
|
|
||
|
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