HTTP 相关汇总 https://developer.mozilla.org/en-US/docs/Web/HTTP HTTP 状态码HTTP access control (CORS)HTTP authenticationHTTP cachingHTTP compressionHTTP conditional requestsHTTP content negotiationHTTP cookiesHTTP range requestsHTTP redirectsHTTP specifications 安全，HTTP header，HTTP Method，HTTP response status code 客户或服务端（如 nginx）可能阻止包含下划线的请求头，尽管下划线符合标准 https://tools.ietf.org/html/rfc3864#section-4.1
