Ajax setRequestHeader，我无法在服务器端获取值

Question

我正在使用XMLHttpRequest发送请求标头：

liveXhr.open("GET", url, true);
liveXhr.setRequestHeader("keychain_id", signatureKEYCHAINID);
liveXhr.setRequestHeader("timestamp", signatureTS);
liveXhr.setRequestHeader("signature", signature);
liveXhr.send();

在我的本地主机上，一切正常，当我登录时：

error_log(print_r(apache_request_headers(), true));

我有这个 ：

[Host] => localhost
[Connection] => keep-alive
[Pragma] => no-cache
[Cache-Control] => no-cache
[timestamp] => 1478279032
[signature] => abcd
[keychain_id] => abcd
[User-Agent] => Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (   KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36
[Content-Type] => text/plain

我可以获取时间戳，签名，keychain_id的值

在我的preprod服务器上，执行相同的过程：

...
[Access-Control-Request-Headers] => keychain_id, signature, timestamp
...

我无法获取时间戳，签名，keychain_id的值。

是Apache设置问题还是其他问题？

Answer 1

尝试：

//array
$requestHeaders = apache_request_headers();

//get array item by name
$keyChainId = $requestHeaders['keychain_id'];
$timestamp = $requestHeaders['timestamp'];
$signature = $requestHeaders['signature'];

//print items
echo "- keychain_id = $keyChainId";
echo "\n- timestamp = $timestamp";
echo "\n- signature = $signature";

[编辑] 尝试：

//not underscore
liveXhr.setRequestHeader("keychainid", KEYCHAINID);
...
//prefix HTTP_
var_dump($_SERVER['HTTP_TIMESTAMP']);
var_dump($_SERVER['HTTP_SIGNATURE']);
var_dump($_SERVER['HTTP_KEYCHAINID']);