| name | 自定义请求标头的名称。不区分大小写。 |
string 自定义请求标头的值。如果未设置具有匹配名称的自定义标头，则返回空字符串。
检索自定义请求标头的值。
此方法可检索自定义（如用户设置的）请求标头的值。这些标头将作为 HTTP 请求的一部分传输到远程服务器。
另请参阅：SetRequestHeader。
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