一、认识HTTP
HTTP协议历史及设计思路(点击浏览)二、获取浏览器HTTP请求header信息
1. Apach服务器下可以直接使用 PHP自带函数获取客户端HTTP请求头信息/*
作用：获取客户端HTTP请求所有头信息(header)
参数：无。
返回：HTTP请求所有头信息数组
*/
getallheaders()
实例：<?php
var_dump(getallheaders());
==>输出array(12) {
["Content-Type"] => string(0) ""
["Content-Length"] => string(1) "0"
["X-Original-Url"] => string(21) "/Home/Other/getHeader"
["Upgrade-Insecure-Requests"] => string(1) "1"
["User-Agent"] => string(114) "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.119 Safari/537.36"
["Host"] => string(17) "www.example.com"
["Cookie"] => string(36) "PHPSESSID=7rjh2uomb8477dggmr85bg9067"
["Accept-Language"] => string(14) "zh-CN,zh;q=0.9"
["Accept-Encoding"] => string(13) "gzip, deflate"
["Accept"] => string(85) "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8"
["Connection"] => string(10) "keep-alive"
["Cache-Control"] => string(9) "max-age=0"
}
2. 非apach环境下，可根据服务器$_SERVER信息获取HTTP请求的header信息，设计函数：function getHeader() {
$headers = array();
foreach ($_SERVER as $key => $value) {
if ('HTTP_' == substr($key, 0, 5)) {
$headers[str_replace('_', '-', substr($key, 5))] = $value;
}
if (isset($_SERVER['PHP_AUTH_DIGEST'])) {
$header['AUTHORIZATION'] = $_SERVER['PHP_AUTH_DIGEST'];
} elseif (isset($_SERVER['PHP_AUTH_USER']) && isset($_SERVER['PHP_AUTH_PW'])) {
$header['AUTHORIZATION'] = base64_encode($_SERVER['PHP_AUTH_USER'] . ':' . $_SERVER['PHP_AUTH_PW']);
}
if (isset($_SERVER['CONTENT_LENGTH'])) {
$header['CONTENT-LENGTH'] = $_SERVER['CONTENT_LENGTH'];
}
if (isset($_SERVER['CONTENT_TYPE'])) {
$header['CONTENT-TYPE'] = $_SERVER['CONTENT_TYPE'];
}
}
return $headers;
}
实例：<?php
var_dump(getHeader());
==>输出array(11) {
["X-ORIGINAL-URL"] => string(21) "/Home/Other/getHeader"
["UPGRADE-INSECURE-REQUESTS"] => string(1) "1"
["USER-AGENT"] => string(114) "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.119 Safari/537.36"
["HOST"] => string(17) "www.example.com"
["COOKIE"] => string(36) "PHPSESSID=7rjh2uomb8477dggmr85bg9067"
["ACCEPT-LANGUAGE"] => string(14) "zh-CN,zh;q=0.9"
["ACCEPT-ENCODING"] => string(13) "gzip, deflate"
["ACCEPT"] => string(85) "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8"
["CONTENT-LENGTH"] => string(1) "0"
["CONNECTION"] => string(10) "keep-alive"
["CACHE-CONTROL"] => string(9) "max-age=0"
}
三、获取服务器HTTP响应header信息/*
作用：获取服务器响应一个 HTTP 请求所发送的所有标头
参数：
url：目标 URL；
format：如果将可选的 format 参数设为 1，则 get_headers() 会解析相应的信息并设定数组的键名。
返回：返回包含有服务器响应一个 HTTP 请求所发送标头的索引或关联数组，如果失败则返回 FALSE。
*/
get_headers ( string $url [,int $format = 0 ] )
实例：<?php
$url = 'http://www.example.com';
print_r(get_headers($url));
print_r(get_headers($url, 1));
?>
==>输出Array
(
[0] => HTTP/1.1 200 OK
[1] => Date: Sat, 29 May 2004 12:28:13 GMT
[2] => Server: Apache/1.3.27 (Unix) (Red-Hat/Linux)
[3] => Last-Modified: Wed, 08 Jan 2003 23:11:55 GMT
[4] => ETag: "3f80f-1b6-3e1cb03b"
[5] => Accept-Ranges: bytes
[6] => Content-Length: 438
[7] => Connection: close
[8] => Content-Type: text/html
)
Array
(
[0] => HTTP/1.1 200 OK
[Date] => Sat, 29 May 2004 12:28:14 GMT
[Server] => Apache/1.3.27 (Unix) (Red-Hat/Linux)
[Last-Modified] => Wed, 08 Jan 2003 23:11:55 GMT
[ETag] => "3f80f-1b6-3e1cb03b"
[Accept-Ranges] => bytes
[Content-Length] => 438
[Connection] => close
[Content-Type] => text/html
)
四，参考资料
1. https://www.yiibai.com/manual/php/function.get-headers.html
2. https://www.oschina.net/question/54100_38761
3. https://blog..net/xuezhiwu001/article/details/61203045
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