它支持多种协议，下面举例讲解如何将它用于网站开发。
一、查看网页源码
直接在curl命令后加上网址，就可以看到网页源码。我们以网址www.sina.com为例（选择该网址，主要因为它的网页代码较短）：
curl www.tvbs.cc
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>301 Moved Permanently</title>
</head><body>
<h1>Moved Permanently</h1>The document has moved <a href="http://www.tvbs.cc/">here.
</body></html>
如果要把这个网页保存下来，可以使用-o参数，这就相当于使用wget命令了。
curl -o [文件名] www.tvbs.cc
二、自动跳转
有的网址是自动跳转的。使用-L参数，curl就会跳转到新的网址。
curl -L www.tvbs.cc
键入上面的命令，结果就自动跳转为www.tvbs.cc。
三、显示头信息
-i参数可以显示http response的头信息，连同网页代码一起。
curl -i www.tvbs.cc
HTTP/1.0 301 Moved Permanently
Date: Sat, 03 Sep 2011 23:44:10 GMT
Server: Apache/2.0.54 (Unix)
Location: http://www.sina.com.cn/
Cache-Control: max-age=3600
Expires: Sun, 04 Sep 2011 00:44:10 GMT
Vary: Accept-Encoding
Content-Length: 231
Content-Type: text/html; charset=iso-8859-1
Age: 3239
X-Cache: HIT from sh201-9.sina.com.cn
Connection: close<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>301 Moved Permanently</title>
</head><body>
<h1>Moved Permanently</h1>The document has moved <a href="http://www.sina.com.cn/">here.
</body></html>
-I参数则是只显示http response的头信息。
四、显示通信过程
-v参数可以显示一次http通信的整个过程，包括端口连接和http request头信息。
curl -v www.tvbs.cc
* About to connect() to www.sina.com port 80 (#0)
* Trying 61.172.201.195... connected
* Connected to www.sina.com (61.172.201.195) port 80 (#0)
> GET / HTTP/1.1
> User-Agent: curl/7.21.3 (i686-pc-linux-gnu) libcurl/7.21.3 OpenSSL/0.9.8o zlib/1.2.3.4 libidn/1.18
> Host: www.sina.com
> Accept: */*
>
* HTTP 1.0, assume close after body
< HTTP/1.0 301 Moved Permanently
< Date: Sun, 04 Sep 2011 00:42:39 GMT
< Server: Apache/2.0.54 (Unix)
< Location: http://www.sina.com.cn/
< Cache-Control: max-age=3600
< Expires: Sun, 04 Sep 2011 01:42:39 GMT
< Vary: Accept-Encoding
< Content-Length: 231
< Content-Type: text/html; charset=iso-8859-1
< X-Cache: MISS from sh201-19.sina.com.cn
< Connection: close
<
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>301 Moved Permanently</title>
</head><body>
<h1>Moved Permanently</h1>The document has moved <a href="http://www.sina.com.cn/">here.
</body></html>
* Closing connection #0
如果你觉得上面的信息还不够，那么下面的命令可以查看更详细的通信过程。
curl --trace output.txt www.tvbs.cc
或者
curl --trace-ascii output.txt www.tvbs.cc
运行后，请打开output.txt文件查看。
五、发送表单信息
发送表单信息有GET和POST两种方法。GET方法相对简单，只要把数据附在网址后面就行。
curl tvbs.cc/form.cgi?data=xxx
POST方法必须把数据和网址分开，curl就要用到--data参数。
curl --data "data=xxx" tvbs.cc/form.cgi
如果你的数据没有经过表单编码，还可以让curl为你编码，参数是--data-urlencode。
curl --data-urlencode "date=April 1" tvbs.cc/form.cgi
六、文件上传
假定文件上传的表单是下面这样：
<form method="POST" enctype='multipart/form-data' action="upload.cgi">
<input type=file name=upload>
<input type=submit name=press value="OK">
</form>
你可以用curl这样上传文件：
curl --form upload=@localfilename --form press=OK [URL]
七、Referer字段
有时你需要在http request头信息中，提供一个referer字段，表示你是从哪里跳转过来的。
curl --referer http://www.tvbs.cc
http://www.tvbs.cc
八、User Agent字段
这个字段是用来表示客户端的设备信息。服务器有时会根据这个字段，针对不同设备，返回不同格式的网页，比如手机版和桌面版。
iPhone4的User Agent是
Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_0 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8A293 Safari/6531.22.7
curl可以这样模拟：
curl --user-agent "[User Agent]" [URL]
九、cookie
使用--cookie参数，可以让curl发送cookie。
curl --cookie "name=xxx" www.tvbs.cc
至于具体的cookie的值，可以从http response头信息的Set-Cookie字段中得到。
十、增加头信息
有时需要在http request之中，自行增加一个头信息。--header参数就可以起到这个作用。
curl --header "xxx: xxxxxx" http://tvbs.cc
十一、HTTP认证
有些网域需要HTTP认证，这时curl需要用到--user参数。
curl --user name:password tvbs.cc
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