diff --git a/header.go b/header.go
index cd7db8f..405e496 100644
--- a/header.go
+++ b/header.go
@@ -26,16 +26,17 @@ const (
 )
 
 const (
-	HeaderKeyContentType    HttpHeader = "Content-Type"    // 请求头中Content-Type的key
-	HeaderKeyCacheControl   HttpHeader = "Cache-Control"   // 禁用缓存
-	HeaderKeyConnection     HttpHeader = "Connection"      // 连接信息
-	HeaderKeyReferer        HttpHeader = "Referer"         // 请求头中Referer的key
-	HeaderKeyUserAgent      HttpHeader = "User-Agent"      // 请求头中User-Agent的key
-	HeaderKeyAccept         HttpHeader = "Accept"          // accept
-	HeaderKeyAcceptEncoding HttpHeader = "Accept-Encoding" // accept-encoding
-	HeaderKeyAcceptLanguage HttpHeader = "Accept-Language" // accept-language
-	HeaderKeyAuthorization  HttpHeader = "Authorization"   // authorization
-	HeaderKeyCookie         HttpHeader = "Cookie"          // cookie
-	HeaderKeyOrigin         HttpHeader = "Origin"          // origin
-	HeaderKeyHost           HttpHeader = "Host"            // host
+	HeaderKeyContentType     HttpHeader = "Content-Type"      // 请求头中Content-Type的key
+	HeaderKeyCacheControl    HttpHeader = "Cache-Control"     // 禁用缓存
+	HeaderKeyConnection      HttpHeader = "Connection"        // 连接信息
+	HeaderKeyXAccelBuffering HttpHeader = "X-Accel-Buffering" // nginx 缓存禁用
+	HeaderKeyReferer         HttpHeader = "Referer"           // 请求头中 Referer的key
+	HeaderKeyUserAgent       HttpHeader = "User-Agent"        // 请求头中User-Agent的key
+	HeaderKeyAccept          HttpHeader = "Accept"            // accept
+	HeaderKeyAcceptEncoding  HttpHeader = "Accept-Encoding"   // accept-encoding
+	HeaderKeyAcceptLanguage  HttpHeader = "Accept-Language"   // accept-language
+	HeaderKeyAuthorization   HttpHeader = "Authorization"     // authorization
+	HeaderKeyCookie          HttpHeader = "Cookie"            // cookie
+	HeaderKeyOrigin          HttpHeader = "Origin"            // origin
+	HeaderKeyHost            HttpHeader = "Host"              // host
 )