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回源配置

内容分发网络 CDN-配置Range回源:背景信息

背景信息 Range信息的作用是在HTTP请求头中指定返回数据的范围，即第一个字节的位置和最后一个字节的位置。如：Range: bytes=0-100就是请求该文件的前101个字节的数据内容。开启Range回源后，当客户端请求某资源，如果CDN节点上未缓存该资源或资源已过期，节点回源时会采用Range请求，从源站分段获取用户需要的部分资源并缓存到CDN节点上。 Range回源能有效缩短大文件的分发时间，提升回源效率，减少回源消耗。

内容分发网络 CDN 回源配置
内容分发网络 CDN-配置回源请求头:使用限制

使用限制如果您的后台存在特殊配置，暂不支持配置Content-Type、Cache-Control、Expires。以下请求头仅支持修改响应头信息，不支持将“请求头操作”类型设置为“删除”： Expires Content-Disposition Content-Type Content-Language Cache-Control - 目前不支持添加/删除/编辑以下标准头部信息： Origin accept-ch clear-site-data push-policy WsTag Tcp-Retrans access-control-allow-methods access-control-max-age Vary Date X-Forward-Type width Age ETag Purge-Extra X-Cacheable access-control-allow-headers Front-End-Https ping-to content-range cross-origin-opener-policy Location viewport-width Mime-Version Proxy-Support X-Resp-Time If-Range sec-fetch-dest device-memory X-Mem-Url Cdn-Src-Ip ping-from Allow X-Url-Blackwhite-List early-data Sec-WebSocket-Extensions if-unmodified-since X-Forward-Uri Conf-File x-download-options X-Error-Status Negotiate x-permitted-cross-domain-policies service-worker-allowed X-Appa x-firefox-spdy content-dpr X-Miss-Times-Limit X-Bwctrl-Limit X-Bwctrl-Para X-Max-Conns nel public-key-pins-report-only X-MAA-Alias Sec-WebSocket-Location X-Cache-2 Authorization Expect last-event-id Sec-WebSocket-Key X-Refresh-Pattern forwarded X-Local-Ip Sec-WebSocket-Protocol feature-policy cross-origin-resource-policy Request-Range Conf-Other strict-transport-security signed-headers Cdn-Server-Ip Sec-WebSocket-Version accept X-Black-List content-location sourcemap Partition-Block-Size Proxy-Authentication-Info cross-origin-embedder-policy X-Request-Id x-dns-prefetch-control if-none-match If-Non-Match Public X-White-List x-ua-compatible Keep-Alive Transfer-Encoding alt-svc max-age Last-Modified x-xss-protection Sec-WebSocket-Nonce dnt Link x-robots-tag Key expect-ct sec-fetch-site access-control-request-headers X-Error-URL X-Log-Url content-encoding X-Times-Limit X-Appa-Origin X-Miss-Rate-Limit X-IP-Region Dynamic X-Squid-Error From accept-ch-lifetime X-MAA-Auth Connection X-Via-CDN Max-Forwards Upgrade sec-fetch-user content-security-policy-report-only Pragma save-data X-Client-Ip Cdn-Qos x-powered-by X-Forward-Measured accept-push-policy server large-allocation X-Request-Uri X-Forward-Ip Host Proxy-Authenticate X-Request-Url X-Cache-Lookup Conf-Option X-Forward-Host upgrade-insecure-requests X-Accelerator-Vary signature X-Ip-Blackwhite-List X-Cdn-Src-Port Sec-WebSocket-Draft Sec-WebSocket-Origin X-IP-Region-CN public-key-pins Ws-Hdr If-Match Proxy-Authorization X-Rate-Limit sec-fetch-mode trailer X-Rewrite-Url Via X-Cache X-Mgr-Traffic accept-signature Warning dpr If-Modified-Since Authentication-Info access-control-request-method Content-Length x-frame-options(xfo) Range A_Dynamic te x-forwarded-host Title WWW-Authenticate tk X-Query-Key accept-charset access-control-allow-origin accept-ranges report-to access-control-expose-headers x-content-type-options Proxy-Connection server-timing Retry-After x-requested-with X-No-Referer X-Forward-Peer Sec-WebSocket-Accept X-Forwarded-For Conf-Err-Host Sec-WebSocket-Key2 access-control-allow-credentials X-Denyattack-Dynconf referer-policy Sec-WebSocket-Key1 content-security-policy timing-allow-origin X-DNS-Time Conf-File-List X-expireURL x-pingback Purge-Domain Server - -

内容分发网络 CDN 回源配置