是否可以向我展示帶有范圍請求的示例http會話。我的意思是請求和響應(yīng)頭是什么？
3 回答
眼眸繁星
TA貢獻(xiàn)1873條經(jīng)驗(yàn) 獲得超9個(gè)贊
以下是Chrome和靜態(tài)網(wǎng)絡(luò)服務(wù)器之間的交換，以檢索MP4視頻。
初始請求-視頻。注意Accept-Ranges響應(yīng)標(biāo)頭以指示服務(wù)器具有范圍標(biāo)頭支持：
GET /BigBuckBunny_320x180.mp4
Cache-Control: max-age=0
Connection: keep-alive
Accept-Language: en-GB,en-US,en
Host: localhost:8080
Range:
Accept: text/html,application/xhtml+xml,application/xml,*/*
User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.7 ...
Accept-Encoding: gzip,deflate,sdch
Accept-Charset: ISO-8859-1,utf-8,*
200 OK
Content-Type: video/mp4
Connection: keep-alive
Last-Modified: Wed,14 Dec 2011 15:50:59 GMT
ETag: A023EF02BD589BC472A2D6774EAE3C58
Transfer-Encoding:
Content-Length: 64657027
Accept-Ranges: bytes
Server: Brisket/1.0.1
Date: Wed,14 Dec 2011 16:11:24 GMT
檢測到先前響應(yīng)中的范圍標(biāo)頭-后續(xù)請求具有開放范圍以確認(rèn)支持。響應(yīng)返回206狀態(tài)和Content-Range標(biāo)頭，以指示響應(yīng)正文中存在的字節(jié)：
GET /BigBuckBunny_320x180.mp4
Connection: keep-alive
Accept-Language: en-GB,en-US,en
Host: localhost:8080
Range: bytes=0-
Accept: */*
User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.7 ...
Referer: http://localhost:8080/BigBuckBunny_320x180.mp4
Accept-Encoding: identity
Accept-Charset: ISO-8859-1,utf-8,*
206 Partial Content
Content-Type: video/mp4
Connection: keep-alive
Last-Modified: Wed,14 Dec 2011 15:50:59 GMT
ETag: A023EF02BD589BC472A2D6774EAE3C58
Transfer-Encoding:
Content-Length: 64657027
Accept-Ranges: bytes
Server: Brisket/1.0.1
Date: Wed,14 Dec 2011 16:11:25 GMT
Content-Range: bytes 0-64657026/64657027
隨后的范圍請求以捕獲文件結(jié)尾（可能是捕獲尾隨的元數(shù)據(jù)）：
GET /BigBuckBunny_320x180.mp4
Connection: keep-alive
Accept-Language: en-GB,en-US,en
Host: localhost:8080
Range: bytes=64312833-64657026
Accept: */*
If-Range: A023EF02BD589BC472A2D6774EAE3C58
User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.7 ...
Referer: http://localhost:8080/BigBuckBunny_320x180.mp4
Accept-Encoding: identity
Accept-Charset: ISO-8859-1,utf-8,*
206 Partial Content
Content-Type: video/mp4
Connection: keep-alive
Last-Modified: Wed,14 Dec 2011 15:50:59 GMT
ETag: A023EF02BD589BC472A2D6774EAE3C58
Transfer-Encoding:
Content-Length: 344194
Accept-Ranges: bytes
Server: Brisket/1.0.1
Date: Wed,14 Dec 2011 16:11:25 GMT
Content-Range: bytes 64312833-64657026/64657027
用戶單擊視頻進(jìn)度條中超出下載范圍的內(nèi)容-發(fā)出范圍請求以從選定位置開始播放：
GET /BigBuckBunny_320x180.mp4
Connection: keep-alive
Accept-Language: en-GB,en-US,en
Host: localhost:8080
Range: bytes=1073152-64313343
Accept: */*
If-Range: A023EF02BD589BC472A2D6774EAE3C58
User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.7 ...
Referer: http://localhost:8080/BigBuckBunny_320x180.mp4
Accept-Encoding: identity
Accept-Charset: ISO-8859-1,utf-8,*
206 Partial Content
Content-Type: video/mp4
Connection: keep-alive
Last-Modified: Wed,14 Dec 2011 15:50:59 GMT
ETag: A023EF02BD589BC472A2D6774EAE3C58
Transfer-Encoding:
Content-Length: 63240192
Accept-Ranges: bytes
Server: Brisket/1.0.1
Date: Wed,14 Dec 2011 16:11:25 GMT
Content-Range: bytes 1073152-64313343/64657027
弒天下
TA貢獻(xiàn)1818條經(jīng)驗(yàn) 獲得超8個(gè)贊
好像服務(wù)器知道自己本身支持范圍請求，并通過Accept-Ranges: bytes標(biāo)頭告訴客戶端“我接受范圍請求” ，但是它還會向下發(fā)送資源的內(nèi)容長度，以便客戶端可以使用上限值發(fā)出范圍請求界。據(jù)我所知，客戶端消息中沒有任何內(nèi)容表明可以執(zhí)行此操作-服務(wù)器可以選擇以“這里是整個(gè)資源”或“我接受范圍請求”進(jìn)行響應(yīng)-再次是Accept-Ranges標(biāo)頭的存在。無論如何，這就是我的理解。
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