Create an HTTP request entity consisting of request headers.
创建一个包含请求头的HTTP请求实体。
HTTP authentication means that the HTTP request has to have an HTTP header field with the userid and password.
HTTP认证意味着HTTP请求必须具有一个带有用户标识和口令的http头字段。
These HTTP request and reply headers occur for content cached in the browser.
对于浏览器中缓存的内容,会出现这些HTTP请求头和响应头。
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