curl POST的数据大于1024字节
20 Jan 11 Expect:100-continue
- 作者: Laruence(
) - 本文地址: http://www.laruence.com/2011/01/20/1840.html
- 转载请注明出处
在使用curl做POST的时候, 当要POST的数据大于1024字节的时候, curl并不会直接就发起POST请求, 而是会分为俩步,
<ol style="line-height: 21px; margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline; list-style-type: none;"><li style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline;"> 1. 发送一个请求, 包含一个Expect:100-continue, 询问Server使用愿意接受数据</li><li style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline;"> 2. 接收到Server返回的100-continue应答以后, 才把数据POST给Server</li><li style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline;"> </li></ol>
这是libcurl的行为.
具体的RFC相关描述: http://www.w3.org/Protocols/rfc2616/rfc2616-sec8.html#sec8.2.3
于是,这样就有了一个问题, 并不是所有的Server都会正确应答100-continue, 比如lighttpd, 就会返回417 “Expectation Failed”, 则会造成逻辑出错,,
要解决的办法也挺容易:
<ol style="line-height: 21px; margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline; list-style-type: none;"><li style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline;"> <span style="margin: 0px; padding: 0px; border: 0px; font-family: inherit; vertical-align: baseline; color: rgb(255, 210, 167);">curl_setopt</span><span style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline;">(</span><span style="margin: 0px; padding: 0px; border: 0px; font-family: inherit; vertical-align: baseline; color: rgb(198, 197, 254);">$ch</span><span style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline;">,</span> CURLOPT_HTTPHEADER<span style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline;">,</span> <span style="margin: 0px; padding: 0px; border: 0px; font-family: inherit; vertical-align: baseline; color: rgb(150, 203, 254);">array</span><span style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline;">(</span><span style="margin: 0px; padding: 0px; border: 0px; font-family: inherit; vertical-align: baseline; color: rgb(168, 255, 96);">'Expect:'</span><span style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline;">));</span></li><li style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline;"> <span style="margin: 0px; padding: 0px; border: 0px; font-family: inherit; vertical-align: baseline; color: rgb(124, 124, 124);">// Disable Expect: header (lighttpd does not support it)</span></li></ol>