content type 介绍

本篇介绍以html表单提交数据为例，讲述content-type头

<!DOCTYPE html>
<html lang="en"> <head> <meta charset="UTF-8"> <title>测试表单提交Post</title> </head> <body> <form action="post.php" method="post"> <input type="text" name='username'> <input type="text" name='password'> <input type="submit"> </form> </body> </html>

这种最常见的表单，它的请求头为：

POST /test/httpPost/post.php HTTP/1.1
Host: localhost
Connection: keep-alive
Content-Length: 27
Cache-Control: max-age=0
Origin: http://localhost
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36
Content-Type: application/x-www-form-urlencoded
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,/;q=0.8
Referer: http://localhost/test/httpPost/index.html
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.8
Cookie: pgv_pvi=8193968128

请求体：
username=zzzz&password=tttt
这里需要注意的是，请求体里的值是经过url encode的

另一种比较复杂的http请求是这样的

<!DOCTYPE html>
<html lang="en"> <head> <meta charset="UTF-8"> <title>测试表单提交Post</title> </head> <body> <form action="post.php" method="post" enctype="multipart/form-data"> <input type="text" name='username'> <input type="text" name='password'> <input type="file" name='picture'> <input type="submit"> </form> </body> </html>

申明了content-type的值为multipart/form-data

这种http post请求头为：
POST /test/httpPost/post.php HTTP/1.1Host: localhost
Connection: keep-alive
Origin: http://localhost
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36
Content-Type: multipart/form-data; boundary=—-WebKitFormBoundaryo8HMWnZkFmHAvcTX声明为这种类型时，后面的boundary参数指定每个参数之间的分隔符
请求体为：
——WebKitFormBoundaryo8HMWnZkFmHAvcTX
Content-Disposition: form-data; name=”username”aaa
——WebKitFormBoundaryo8HMWnZkFmHAvcTX
Content-Disposition: form-data; name=”password”bbb
——WebKitFormBoundaryo8HMWnZkFmHAvcTX
Content-Disposition: form-data; name=”picture”; filename=”1488794518kqnZP.jpg”
Content-Type: image/jpeg——WebKitFormBoundaryo8HMWnZkFmHAvcTX–注意这时候的值没有经过url encode

转载于:https://www.cnblogs.com/amyleell/p/9119796.html

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