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<body>
<h3 id="-">概述</h3>
<p>此文档列举了前后端通讯时的几种报文格式。</p>
<h3 id="-url-">请求URL格式</h3>
<p>请求URL类似于：<code>http[s]://IP:Port/a/d/c</code>，其中<code>http[s]://IP:Port</code>是相对固定的，可做常量配置。</p>
<h3 id="-">报文基本格式</h3>
<h5 id="-">请求包括</h5>
<ol>
<li>请求方法：<ul>
<li>GET 一般用户读数据</li><li>POST/PUT 一般用于创建或者更新数据</li><li>DELETE 一般用于删除数据</li></ul>
</li><li>请求头，即Header部分：<ul>
<li>X-AUTH-TOKEN：用于传递请求token</li><li>Content-Type：见报文</li><li>Accept：见报文</li></ul>
</li><li>请求体<ul>
<li>form格式或者json格式</li></ul>
</li></ol>
<h5 id="-">响应</h5>
<ol>
<li>HTTP状态码，见码表<ul>
<li>做响应处理时，应该首先判断HTTP状态码</li></ul>
</li><li>响应头<ul>
<li>处理响应体时，应该首先确定<code>Content-Type</code></li></ul>
</li><li>响应体<ul>
<li>根据响应头中的<code>Content-Type</code>处理</li><li>注意：业务异常时，有个<code>bizcode</code>可以做业务处理</li><li>注意：业务异常或者系统异常时，有个<code>ddzcode</code>标记出问题的系统</li></ul>
</li></ol>
<h3 id="-">报文</h3>
<h4 id="-">正常报文</h4>
<p>正常的请求，返回状态码一般为<code>2xx</code>，可能不仅仅是<code>200</code>；<br>正常的请求，前端直接处理返回数据即可。</p>
<pre><code>请求：
curl --include --location --request GET 'http://127.0.0.1:9000/api/test/link/get'
或者：
curl --include --location --request GET 'http://127.0.0.1:9000/api/test/link/get?test1=123123'
响应：
HTTP/1.1 200 OK
transfer-encoding: chunked
Content-Type: application/json;charset=UTF-8
Date: Sat, 15 Feb 2020 21:25:16 GMT
{"key_a1":"中文val"}
</code></pre><pre><code>请求：
curl --include --location --request POST 'http://127.0.0.1:9000/api/test/link/post' \
--header 'Content-Type: application/json; charset=utf-8' \
--data-raw '{
"test1": "中文",
"test2": "23a324"
}'
响应：
HTTP/1.1 200 OK
transfer-encoding: chunked
Content-Type: application/json;charset=UTF-8
Date: Sat, 15 Feb 2020 21:27:57 GMT
{"key_a1":"中文val"}
</code></pre><pre><code>请求：
curl --include --location --request POST 'http://127.0.0.1:9000/api/test/link/post' \
--header 'Content-Type: application/x-www-form-urlencoded' \
--data-urlencode 'test1=中文' \
--data-urlencode 'test2=123'
响应：
HTTP/1.1 200 OK
transfer-encoding: chunked
Content-Type: application/json;charset=UTF-8
Date: Sat, 15 Feb 2020 21:40:33 GMT
{"key_a1":"中文val"}
</code></pre><p>注意：Content-Type: application/json; charset=utf-8或者Content-Type: application/x-www-form-urlencoded会对服务器取值造成影响！使用时需和后端商议妥当。</p>
<h4 id="-">业务异常报文</h4>
<p>业务异常代表程序在处理业务时，遇到条件不符合的情况，而终止了请求，比如：用户年龄大于xx、身份证格式不符合等；<br>注意<code>bizcode</code>，后端可以设置<code>bizcode</code>和前端通讯，前端可以利用这个<code>bizcode</code>做一些判断操作；<br>业务异常一般都是<code>4xx</code>的状态码；<br>业务异常一般直接判断提示<code>message</code>字段返回的内容即可。</p>
<pre><code>请求：
curl --include --location --request POST 'http://127.0.0.1:9000/api/test/link/post' \
--header 'Content-Type: application/x-www-form-urlencoded' \
--data-raw '{
"test1": "中文",
"test2": "23a324"
}'
响应：
HTTP/1.1 402 Payment Required
Content-Type: application/json;charset=UTF-8
Content-Length: 163
{"timestamp":"2020-02-16T20:36:32.818+0000","path":"/api/test/link/get","status":402,"error":"Payment Required","message":"错误测试","bizcode":221,"ddzcode":0}
</code></pre><h4 id="-">系统代码异常报文</h4>
<p>系统代码异常表示后端系统在编码上出现了错误，这种情况应该友好的提示前端用户。</p>
<pre><code>请求：
curl --include --location --request GET 'http://127.0.0.1:9000/api/test/link/get?test1=123123'
响应：
HTTP/1.1 500 Internal Server Error
Content-Type: application/json;charset=UTF-8
Content-Length: 156
{"timestamp":"2020-02-16T20:34:59.857+0000","path":"/api/test/link/get","status":500,"error":"Internal Server Error","message":null,"bizcode":0,"ddzcode":0}
</code></pre><p><strong>注意</strong>：<br>不管是业务异常还是系统异常，皆有一个<code>ddzcode</code>错误码，此错误码代表发生问题的系统，比如，系统后台调用了核心系统，当因为核心系统的问题，发生错误时，此<code>ddzcode</code>会返回代表核心系统的码值，方便前端提示给用户到底是哪个系统出现了问题；具体码值，前后端开发时商议而定。</p>
<h4 id="-">其他报文</h4>
<h5 id="-accept-application-json-"><code>Accept</code>目前只支持<code>application/json</code></h5>
<pre><code>请求：（注意Accept设置后的响应！）
curl --include --location --request POST 'http://127.0.0.1:9000/api/test/link/post' \
--header 'Content-Type: application/json; charset=utf-8' \
--header 'Accept: text/plain' \
--data-raw '{
"test1": "中文",
"test2": "23a324"
}'
响应：
HTTP/1.1 406 Not Acceptable
Content-Length: 0
Date: Sat, 15 Feb 2020 21:33:43 GMT
</code></pre><pre><code>请求：
curl --include --location --request POST 'http://127.0.0.1:9000/api/test/link/post' \
> --header 'Content-Type: application/json; charset=utf-8' \
> --header 'Accept: application/json; charset=utf-8' \
> --data-raw '{
> "test1": "中文",
> "test2": "23a324"
> }'
响应：
HTTP/1.1 200 OK
transfer-encoding: chunked
Content-Type: application/json;charset=utf-8
Date: Sat, 15 Feb 2020 21:35:12 GMT
{"key_a1":"中文val"}
</code></pre><h3 id="http-">HTTP码表</h3>
<p>至多返回这些，不会超过下表，但是最常用的还是<code>200</code>、<code>400</code>、<code>401</code>、<code>403</code>、<code>404</code>、<code>405</code>、<code>500</code>。</p>
<pre><code>// 1xx Informational
/**
* {@code 100 Continue}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.2.1">HTTP/1.1: Semantics and Content, section 6.2.1</a>
*/
CONTINUE(100, "Continue"),
/**
* {@code 101 Switching Protocols}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.2.2">HTTP/1.1: Semantics and Content, section 6.2.2</a>
*/
SWITCHING_PROTOCOLS(101, "Switching Protocols"),
/**
* {@code 102 Processing}.
* @see <a href="https://tools.ietf.org/html/rfc2518#section-10.1">WebDAV</a>
*/
PROCESSING(102, "Processing"),
/**
* {@code 103 Checkpoint}.
* @see <a href="https://code.google.com/p/gears/wiki/ResumableHttpRequestsProposal">A proposal for supporting
* resumable POST/PUT HTTP requests in HTTP/1.0</a>
*/
CHECKPOINT(103, "Checkpoint"),
// 2xx Success
/**
* {@code 200 OK}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.3.1">HTTP/1.1: Semantics and Content, section 6.3.1</a>
*/
OK(200, "OK"),
/**
* {@code 201 Created}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.3.2">HTTP/1.1: Semantics and Content, section 6.3.2</a>
*/
CREATED(201, "Created"),
/**
* {@code 202 Accepted}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.3.3">HTTP/1.1: Semantics and Content, section 6.3.3</a>
*/
ACCEPTED(202, "Accepted"),
/**
* {@code 203 Non-Authoritative Information}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.3.4">HTTP/1.1: Semantics and Content, section 6.3.4</a>
*/
NON_AUTHORITATIVE_INFORMATION(203, "Non-Authoritative Information"),
/**
* {@code 204 No Content}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.3.5">HTTP/1.1: Semantics and Content, section 6.3.5</a>
*/
NO_CONTENT(204, "No Content"),
/**
* {@code 205 Reset Content}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.3.6">HTTP/1.1: Semantics and Content, section 6.3.6</a>
*/
RESET_CONTENT(205, "Reset Content"),
/**
* {@code 206 Partial Content}.
* @see <a href="https://tools.ietf.org/html/rfc7233#section-4.1">HTTP/1.1: Range Requests, section 4.1</a>
*/
PARTIAL_CONTENT(206, "Partial Content"),
/**
* {@code 207 Multi-Status}.
* @see <a href="https://tools.ietf.org/html/rfc4918#section-13">WebDAV</a>
*/
MULTI_STATUS(207, "Multi-Status"),
/**
* {@code 208 Already Reported}.
* @see <a href="https://tools.ietf.org/html/rfc5842#section-7.1">WebDAV Binding Extensions</a>
*/
ALREADY_REPORTED(208, "Already Reported"),
/**
* {@code 226 IM Used}.
* @see <a href="https://tools.ietf.org/html/rfc3229#section-10.4.1">Delta encoding in HTTP</a>
*/
IM_USED(226, "IM Used"),
// 3xx Redirection
/**
* {@code 300 Multiple Choices}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.4.1">HTTP/1.1: Semantics and Content, section 6.4.1</a>
*/
MULTIPLE_CHOICES(300, "Multiple Choices"),
/**
* {@code 301 Moved Permanently}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.4.2">HTTP/1.1: Semantics and Content, section 6.4.2</a>
*/
MOVED_PERMANENTLY(301, "Moved Permanently"),
/**
* {@code 302 Found}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.4.3">HTTP/1.1: Semantics and Content, section 6.4.3</a>
*/
FOUND(302, "Found"),
/**
* {@code 302 Moved Temporarily}.
* @see <a href="https://tools.ietf.org/html/rfc1945#section-9.3">HTTP/1.0, section 9.3</a>
* @deprecated in favor of {@link #FOUND} which will be returned from {@code HttpStatus.valueOf(302)}
*/
@Deprecated
MOVED_TEMPORARILY(302, "Moved Temporarily"),
/**
* {@code 303 See Other}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.4.4">HTTP/1.1: Semantics and Content, section 6.4.4</a>
*/
SEE_OTHER(303, "See Other"),
/**
* {@code 304 Not Modified}.
* @see <a href="https://tools.ietf.org/html/rfc7232#section-4.1">HTTP/1.1: Conditional Requests, section 4.1</a>
*/
NOT_MODIFIED(304, "Not Modified"),
/**
* {@code 305 Use Proxy}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.4.5">HTTP/1.1: Semantics and Content, section 6.4.5</a>
* @deprecated due to security concerns regarding in-band configuration of a proxy
*/
@Deprecated
USE_PROXY(305, "Use Proxy"),
/**
* {@code 307 Temporary Redirect}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.4.7">HTTP/1.1: Semantics and Content, section 6.4.7</a>
*/
TEMPORARY_REDIRECT(307, "Temporary Redirect"),
/**
* {@code 308 Permanent Redirect}.
* @see <a href="https://tools.ietf.org/html/rfc7238">RFC 7238</a>
*/
PERMANENT_REDIRECT(308, "Permanent Redirect"),
// --- 4xx Client Error ---
/**
* {@code 400 Bad Request}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.5.1">HTTP/1.1: Semantics and Content, section 6.5.1</a>
*/
BAD_REQUEST(400, "Bad Request"),
/**
* {@code 401 Unauthorized}.
* @see <a href="https://tools.ietf.org/html/rfc7235#section-3.1">HTTP/1.1: Authentication, section 3.1</a>
*/
UNAUTHORIZED(401, "Unauthorized"),
/**
* {@code 402 Payment Required}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.5.2">HTTP/1.1: Semantics and Content, section 6.5.2</a>
*/
PAYMENT_REQUIRED(402, "Payment Required"),
/**
* {@code 403 Forbidden}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.5.3">HTTP/1.1: Semantics and Content, section 6.5.3</a>
*/
FORBIDDEN(403, "Forbidden"),
/**
* {@code 404 Not Found}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.5.4">HTTP/1.1: Semantics and Content, section 6.5.4</a>
*/
NOT_FOUND(404, "Not Found"),
/**
* {@code 405 Method Not Allowed}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.5.5">HTTP/1.1: Semantics and Content, section 6.5.5</a>
*/
METHOD_NOT_ALLOWED(405, "Method Not Allowed"),
/**
* {@code 406 Not Acceptable}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.5.6">HTTP/1.1: Semantics and Content, section 6.5.6</a>
*/
NOT_ACCEPTABLE(406, "Not Acceptable"),
/**
* {@code 407 Proxy Authentication Required}.
* @see <a href="https://tools.ietf.org/html/rfc7235#section-3.2">HTTP/1.1: Authentication, section 3.2</a>
*/
PROXY_AUTHENTICATION_REQUIRED(407, "Proxy Authentication Required"),
/**
* {@code 408 Request Timeout}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.5.7">HTTP/1.1: Semantics and Content, section 6.5.7</a>
*/
REQUEST_TIMEOUT(408, "Request Timeout"),
/**
* {@code 409 Conflict}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.5.8">HTTP/1.1: Semantics and Content, section 6.5.8</a>
*/
CONFLICT(409, "Conflict"),
/**
* {@code 410 Gone}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.5.9">
* HTTP/1.1: Semantics and Content, section 6.5.9</a>
*/
GONE(410, "Gone"),
/**
* {@code 411 Length Required}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.5.10">
* HTTP/1.1: Semantics and Content, section 6.5.10</a>
*/
LENGTH_REQUIRED(411, "Length Required"),
/**
* {@code 412 Precondition failed}.
* @see <a href="https://tools.ietf.org/html/rfc7232#section-4.2">
* HTTP/1.1: Conditional Requests, section 4.2</a>
*/
PRECONDITION_FAILED(412, "Precondition Failed"),
/**
* {@code 413 Payload Too Large}.
* @since 4.1
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.5.11">
* HTTP/1.1: Semantics and Content, section 6.5.11</a>
*/
PAYLOAD_TOO_LARGE(413, "Payload Too Large"),
/**
* {@code 413 Request Entity Too Large}.
* @see <a href="https://tools.ietf.org/html/rfc2616#section-10.4.14">HTTP/1.1, section 10.4.14</a>
* @deprecated in favor of {@link #PAYLOAD_TOO_LARGE} which will be
* returned from {@code HttpStatus.valueOf(413)}
*/
@Deprecated
REQUEST_ENTITY_TOO_LARGE(413, "Request Entity Too Large"),
/**
* {@code 414 URI Too Long}.
* @since 4.1
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.5.12">
* HTTP/1.1: Semantics and Content, section 6.5.12</a>
*/
URI_TOO_LONG(414, "URI Too Long"),
/**
* {@code 414 Request-URI Too Long}.
* @see <a href="https://tools.ietf.org/html/rfc2616#section-10.4.15">HTTP/1.1, section 10.4.15</a>
* @deprecated in favor of {@link #URI_TOO_LONG} which will be returned from {@code HttpStatus.valueOf(414)}
*/
@Deprecated
REQUEST_URI_TOO_LONG(414, "Request-URI Too Long"),
/**
* {@code 415 Unsupported Media Type}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.5.13">
* HTTP/1.1: Semantics and Content, section 6.5.13</a>
*/
UNSUPPORTED_MEDIA_TYPE(415, "Unsupported Media Type"),
/**
* {@code 416 Requested Range Not Satisfiable}.
* @see <a href="https://tools.ietf.org/html/rfc7233#section-4.4">HTTP/1.1: Range Requests, section 4.4</a>
*/
REQUESTED_RANGE_NOT_SATISFIABLE(416, "Requested range not satisfiable"),
/**
* {@code 417 Expectation Failed}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.5.14">
* HTTP/1.1: Semantics and Content, section 6.5.14</a>
*/
EXPECTATION_FAILED(417, "Expectation Failed"),
/**
* {@code 418 I'm a teapot}.
* @see <a href="https://tools.ietf.org/html/rfc2324#section-2.3.2">HTCPCP/1.0</a>
*/
I_AM_A_TEAPOT(418, "I'm a teapot"),
/**
* @deprecated See
* <a href="https://tools.ietf.org/rfcdiff?difftype=--hwdiff&url2=draft-ietf-webdav-protocol-06.txt">
* WebDAV Draft Changes</a>
*/
@Deprecated
INSUFFICIENT_SPACE_ON_RESOURCE(419, "Insufficient Space On Resource"),
/**
* @deprecated See
* <a href="https://tools.ietf.org/rfcdiff?difftype=--hwdiff&url2=draft-ietf-webdav-protocol-06.txt">
* WebDAV Draft Changes</a>
*/
@Deprecated
METHOD_FAILURE(420, "Method Failure"),
/**
* @deprecated
* See <a href="https://tools.ietf.org/rfcdiff?difftype=--hwdiff&url2=draft-ietf-webdav-protocol-06.txt">
* WebDAV Draft Changes</a>
*/
@Deprecated
DESTINATION_LOCKED(421, "Destination Locked"),
/**
* {@code 422 Unprocessable Entity}.
* @see <a href="https://tools.ietf.org/html/rfc4918#section-11.2">WebDAV</a>
*/
UNPROCESSABLE_ENTITY(422, "Unprocessable Entity"),
/**
* {@code 423 Locked}.
* @see <a href="https://tools.ietf.org/html/rfc4918#section-11.3">WebDAV</a>
*/
LOCKED(423, "Locked"),
/**
* {@code 424 Failed Dependency}.
* @see <a href="https://tools.ietf.org/html/rfc4918#section-11.4">WebDAV</a>
*/
FAILED_DEPENDENCY(424, "Failed Dependency"),
/**
* {@code 426 Upgrade Required}.
* @see <a href="https://tools.ietf.org/html/rfc2817#section-6">Upgrading to TLS Within HTTP/1.1</a>
*/
UPGRADE_REQUIRED(426, "Upgrade Required"),
/**
* {@code 428 Precondition Required}.
* @see <a href="https://tools.ietf.org/html/rfc6585#section-3">Additional HTTP Status Codes</a>
*/
PRECONDITION_REQUIRED(428, "Precondition Required"),
/**
* {@code 429 Too Many Requests}.
* @see <a href="https://tools.ietf.org/html/rfc6585#section-4">Additional HTTP Status Codes</a>
*/
TOO_MANY_REQUESTS(429, "Too Many Requests"),
/**
* {@code 431 Request Header Fields Too Large}.
* @see <a href="https://tools.ietf.org/html/rfc6585#section-5">Additional HTTP Status Codes</a>
*/
REQUEST_HEADER_FIELDS_TOO_LARGE(431, "Request Header Fields Too Large"),
/**
* {@code 451 Unavailable For Legal Reasons}.
* @see <a href="https://tools.ietf.org/html/draft-ietf-httpbis-legally-restricted-status-04">
* An HTTP Status Code to Report Legal Obstacles</a>
* @since 4.3
*/
UNAVAILABLE_FOR_LEGAL_REASONS(451, "Unavailable For Legal Reasons"),
// --- 5xx Server Error ---
/**
* {@code 500 Internal Server Error}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.6.1">HTTP/1.1: Semantics and Content, section 6.6.1</a>
*/
INTERNAL_SERVER_ERROR(500, "Internal Server Error"),
/**
* {@code 501 Not Implemented}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.6.2">HTTP/1.1: Semantics and Content, section 6.6.2</a>
*/
NOT_IMPLEMENTED(501, "Not Implemented"),
/**
* {@code 502 Bad Gateway}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.6.3">HTTP/1.1: Semantics and Content, section 6.6.3</a>
*/
BAD_GATEWAY(502, "Bad Gateway"),
/**
* {@code 503 Service Unavailable}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.6.4">HTTP/1.1: Semantics and Content, section 6.6.4</a>
*/
SERVICE_UNAVAILABLE(503, "Service Unavailable"),
/**
* {@code 504 Gateway Timeout}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.6.5">HTTP/1.1: Semantics and Content, section 6.6.5</a>
*/
GATEWAY_TIMEOUT(504, "Gateway Timeout"),
/**
* {@code 505 HTTP Version Not Supported}.
* @see <a href="https://tools.ietf.org/html/rfc7231#section-6.6.6">HTTP/1.1: Semantics and Content, section 6.6.6</a>
*/
HTTP_VERSION_NOT_SUPPORTED(505, "HTTP Version not supported"),
/**
* {@code 506 Variant Also Negotiates}
* @see <a href="https://tools.ietf.org/html/rfc2295#section-8.1">Transparent Content Negotiation</a>
*/
VARIANT_ALSO_NEGOTIATES(506, "Variant Also Negotiates"),
/**
* {@code 507 Insufficient Storage}
* @see <a href="https://tools.ietf.org/html/rfc4918#section-11.5">WebDAV</a>
*/
INSUFFICIENT_STORAGE(507, "Insufficient Storage"),
/**
* {@code 508 Loop Detected}
* @see <a href="https://tools.ietf.org/html/rfc5842#section-7.2">WebDAV Binding Extensions</a>
*/
LOOP_DETECTED(508, "Loop Detected"),
/**
* {@code 509 Bandwidth Limit Exceeded}
*/
BANDWIDTH_LIMIT_EXCEEDED(509, "Bandwidth Limit Exceeded"),
/**
* {@code 510 Not Extended}
* @see <a href="https://tools.ietf.org/html/rfc2774#section-7">HTTP Extension Framework</a>
*/
NOT_EXTENDED(510, "Not Extended"),
/**
* {@code 511 Network Authentication Required}.
* @see <a href="https://tools.ietf.org/html/rfc6585#section-6">Additional HTTP Status Codes</a>
*/
NETWORK_AUTHENTICATION_REQUIRED(511, "Network Authentication Required");
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