how to resume an interrupted download - part 2
This is a continuation of my previous question which I posted when I wasn't a registered user. As a refresher, I'm trying to resume the downloading of a large file from my Yahoo! web site server when the download gets interrupted. I previously thought the interruption was due to a 100 second timeout limit (because Yahoo! enforces that time limit on user written scripts). However, when I measured the timing of the download interrupts, I saw that the interrupt timing varies a lot (sometimes the download runs uninterrupted for less than 100 seconds and sometimes up to seven minutes). So I don't know the reason for the timeouts and I'm just trying to work around them.
I tried the suggestion by naikus (thank you) and, according to the dump of http header fields, it appears that my Yahoo! web site server does recognize the "range" property that should allow the download to resume at the offset of the interruption. Unfortunately, although the byte range appears correct in the http header in the resumed connections, the transferred content always restarts at the beginning of the file. (My test file is an array of 50,000 4-byte integers that increments starting at 0. My downloaded file always starts recounting at 0 at every offset at which a download interrupt occurred.)
Is there some other http connection property request I should be making to get the Yahoo! server to actually skip to the file offset specified in the header's byte range? Here's the code and what it dumps:
// Setup connection.
URL url = new URL(strUrl[0]);
URLConnection connection = url.openConnection();
downloaded = Integer.parseInt(strUrl[3]);
if (downloaded > 0) {
connection.setRequestProperty("Range", "bytes="+downloaded+"-");
connection.connect();
fileLength = mDownloadFileLength;
Log.d("AsyncDownloadFile",
"new download seek: " + downloaded +
"; lengthFile: " + fileLength);
}
else {
connection.connect();
downloaded = 0;
fileLength = connection.getContentLength();
mDownloadFileLength = fileLength;
}
Map<String, List<String>> map = connection.getHeaderFields();
Log.d("AsyncDownloadFile", "header fields: " + map.toString());
// Setup streams and buffers.
input = new BufferedInputStream(url.openStream(), 8192);
outFile = new RandomAccessFile(strUrl[1], "rw");
if (downloaded > 0)
outFile.seek(downloaded);
byte data[] = new byte[1024];
// Download file.
for (int count=0, i=0; (count=input.read(data, 0, 1024)) != -1; i++) {
outFile.write(data, 0, count);
downloaded += count;
if (downloaded >= fileLength)
break;
// Display progress.
Log.d("AsyncDownloadFile", "bytes: " + downloaded);
if ((i%10) == 0)
publishProgress((int)(downloaded*100/fileLength));
if (mFlagDisableAsyncTask) {
downloaded = 0;
break;
}
}
// Close streams.
outFile.close();
input.close();
dump:
@ 4:08:24
D/AsyncDownloadFile( 2372): header fields: {p3p=[policyref="http://info.yahoo.co
m/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi
OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA PO
L HEA PRE LOC GOV"], content-type=[application/zip], connection=[close], last-mo
dified=[Fri, 06 Aug 2010 14:47:50 GMT], content-length=[2000000], age=[0], serve
r=[YTS/1.17.13], accept-ranges=[bytes], date=[Fri, 06 Aug 2010 20:08:33 GMT]}
D/AsyncDownloadFile( 2372): bytes: 1024
D/AsyncDownloadFile( 2372): bytes: 1033
D/AsyncDownloadFile( 2372): bytes: 2057
D/AsyncDownloadFile( 2372): bytes: 2493
D/AsyncDownloadFile( 2372): bytes: 3517
D/AsyncDownloadFile( 2372): bytes: 3953
.
.
.
@ 4:13:25
D/AsyncDownloadFile( 2372): bytes: 386473
D/AsyncDownloadFile( 2372): bytes: 387497
D/AsyncDownloadFile( 2372): bytes: 387933
D/AsyncDownloadFile( 2372): new download seek: 387933; lengthFile: 2000000
D/AsyncDownloadFile( 2372): header fields: {p3p=[policyref="http://info.yahoo.co
m/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi
OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA PO
L HEA PRE LOC GOV"], content-type=[application/zip], connection=[close], last-mo
dified=[Fri, 06 Aug 2010 14:47:50 GMT], content-length=[1612067], age=[0], serve
r=[YTS/1.17.13], accept-ranges=[bytes], date=[Fri, 06 Aug 2010 20:13:29 GMT], co
ntent-range=[bytes 387933-1999999/2000000]}
D/AsyncDownloadFile( 2372): bytes: 388957
D/AsyncDownloadFile( 2372): bytes: 389981
D/AsyncDownloadFile( 2372): bytes: 390409
D/AsyncDownloadFile( 2372): bytes: 391433
D/AsyncDownloadFile( 2372): bytes: 391869
D/AsyncDownloadFile( 2372): bytes: 392893
.
.
.
@ 4:18:45
D/AsyncDownloadFile( 2372): bytes: 775413
D/AsyncDownloadFile( 2372): bytes: 775849
D/AsyncDownloadFile( 2372): bytes: 776873
D/AsyncDownloadFile( 2372): bytes: 777309
D/AsyncDownloadFile( 2372): new download seek: 777309; lengthFile: 2000000
D/AsyncDownloadFile( 2372): header fields: {p3p=[policyref="http://info.yahoo.co
m/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi
OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA PO
L HEA PRE LOC GOV"], content-type=[application/zip], connection=[close], last-mo
dified=[Fri, 06 Aug 2010 14:47:50 GMT], content-length=[1222691], age=[0], serve
r=[YTS/1.17.13], accept-ranges=[bytes], date=[Fri, 06 Aug 2010 20:18:54 GMT], co
ntent-range=[bytes 777309-1999999/2000000]}
D/dalvikvm( 2372): GC_FOR_MALLOC freed 11019 objects / 470560 bytes in 155ms
D/AsyncDownloadFile( 2372): bytes: 778333
D/AsyncDownloadFile( 2372): bytes: 779357
D/AsyncDownloadFile( 2372): bytes: 779790
D/AsyncDownloadFile( 2372): bytes: 780814
D/AsyncDownloadFile( 2372): bytes: 781250
D/AsyncDownloadFile( 2372): bytes: 782274
.
.
.
@ 4:23:45
D/AsyncDownloadFile( 2372): bytes: 1163334
D/AsyncDownloadFile( 2372): bytes: 1163770
D/AsyncDownloadFile( 2372): bytes: 1164794
D/AsyncDownloadFile( 2372): bytes: 1165230
D/AsyncDownloadFile( 2372): new download seek: 1165230; lengthFile: 2000000
D/AsyncDownloadFile( 2372): header fields: {p3p=[policyref="http://info.yahoo.co
m/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi
OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA PO
L HEA PRE LOC GOV"], content-type=[application/zip], connection=[close], last-mo
dified=[Fri, 06 Aug 2010 14:47:50 GMT], content-length=[834770], age=[0], server
=[YTS/1.17.13], accept-ranges=[bytes], date=[Fri, 06 Aug 2010 20:23:47 GMT], con
tent-range=[bytes 1165230-1999999/2000000]}
D/AsyncDownloadFile( 2372): bytes: 1166246
D/AsyncDownloadFile( 2372): bytes: 1167270
D/AsyncDownloadFile( 2372): bytes: 1167706
D/AsyncDownloadFile( 2372): bytes: 1168730
D/AsyncDownloadFile( 2372): bytes: 1169754
D/AsyncDownloadFile( 2372): bytes: 1170778
.
.
.
@ 4:30:25
D/AsyncDownloadFile( 2372): bytes: 1551255
D/AsyncDownloadFile( 2372): bytes: 1551691
D/AsyncDownloadFile( 2372): bytes: 1552715
D/AsyncDownloadFile( 2372): bytes: 1553151
D/AsyncDownloadFile( 2372): new download seek: 1553151; lengthFile: 2000000
D/AsyncDownloadFile( 2372): header fields: {p3p=[policyref="http://info.yahoo.co
m/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi
OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA PO
L HEA PRE LOC GOV"], content-type=[application/zip], connection=[close], last-mo
dified=[Fri, 06 Aug 2010 14:47:50 GMT], content-length=[446849], age=[0], server
=[YTS/1.17.13], accept-ranges=[bytes], date=[Fri, 06 Aug 2010 20:30:44 GMT], con
tent-range=[bytes 1553151-1999999/2000000]}
D/AsyncDownloadFile( 2372): bytes: 1554167
D/AsyncDownloadFile( 2372): bytes: 1554184
D/AsyncDownloadFile( 2372): bytes: 1555208
D/AsyncDownloadFile( 2372): bytes: 1555644
D/AsyncDownloadFile( 2372): bytes: 1556668
D/AsyncDownloadFile( 2372): bytes: 1557104
.
.
.
@ 4:37:10
D/AsyncDownloadFile( 2372): bytes: 1939188
D/AsyncDownloadFile( 2372): bytes: 1939624
D/AsyncDownloadFile( 2372): bytes: 1940648
D/AsyncDownloadFile( 2372): bytes: 1941084
D/AsyncDownloadFile( 2372): new download seek: 1941084; lengthFile: 2000000
D/dalvikvm( 2372): GC_FOR_MALLOC freed 13701 objects / 604600 bytes in 128ms
D/AsyncDownloadFile( 2372): header fields: {p3p=[policyref="http://info.yahoo.co
m/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi
OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA PO
L HEA PRE LOC GOV"], content-type=[application/zip], connection=[close], last-mo
dified=[Fri, 06 Aug 2010 14:47:50 GMT], content-length=[58916], age=[0], server=
[YTS/1.17.13], accept-ranges=[bytes], date=[Fri, 06 Aug 2010 20:37:16 GMT], cont
ent-range=[bytes 1941084-1999999/2000000]}
D/AsyncDownloadFile( 2372): bytes: 1942108
D/AsyncDownloadFile( 2372): bytes: 1942117
D/AsyncDownloadFile( 2372): bytes: 1943141
D/AsyncDownloadFile( 2372): bytes: 1943577
D/AsyncDownloadFile( 2372): bytes: 1944601
D/AsyncDownloadFile( 2372): bytes: 1945037
.
.
.
@ 4:38:30
D/AsyncDownloadFile( 2372): bytes: 1993217
D/AsyncDownloadFile( 2372): bytes: 1994241
D/AsyncDownloadFile( 2372): bytes: 1994677
D/AsyncDownloadFile( 2372): bytes: 1995701
D/AsyncDownloadFile( 2372): bytes: 1996137
D/AsyncDownloadFile( 2372): bytes: 1997161
D/AsyncDownloadFile( 2372): bytes: 1997597
D/AsyncDownloadFile( 2372): bytes: 1998621
D/AsyncDownloadFile( 2372): bytes: 1999057
D/onPostExecute( 2372): download: unsuccessful
- - -
After the tip from BalusC (thanks), I modified the connection setup but the Yahoo! server continues to reset to the start of the file at each interrupt. Here's the changed code and the resulting dumps:
// Setup connection.
URL url = new URL(strUrl[0]);
URLConnection connection = url.openConnection();
downloaded = Integer.parseInt(strUrl[3]);
if (downloaded == 0) {
connection.connect();
strLastModified = connection.getHeaderField("Last-Modified");
fileLength = connection.getContentLength();
mDownloadFileLength = fileLength;
}
else {
connection.setRequestProperty("Range", "bytes=" + downloaded + "-");
connection.setRequestProperty("If-Range", strLastModified);
connection.connect();
fileLength = mDownloadFileLength;
Log.d("AsyncDownloadFile",
"new download seek: " + downloaded +
"; lengthFile: " + fileLength);
}
map = connection.getHeaderFields();
Log.d("AsyncDownloadFile", "header fields: " + map.toString());
dump:
@12:36:40 started
D/AsyncDownloadFile( 413): header fields: {p3p=[policyref="http://info.yahoo.c
m/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTP
OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA P
L HEA PRE LOC GOV"], content-type=[application/zip], connection=[close], last-m
dified=[Fri, 06 Aug 2010 14:47:50 GMT], content-length=[2000000], age=[0], serv
r=[YTS/1.17.13], accept-ranges=[bytes], date=[Sat, 07 Aug 2010 04:36:56 GMT]}
D/AsyncDownloadFile( 413): bytes: 1024
D/AsyncDownloadFile( 413): bytes: 2048
D/AsyncDownloadFile( 413): bytes: 2476
D/AsyncDownloadFile( 413): bytes: 3500
D/AsyncDownloadFile( 413): bytes: 3936
...
@12:39:20 interrupted
D/AsyncDownloadFile( 413): bytes: 388068
D/AsyncDownloadFile( 413): bytes: 389092
D/AsyncDownloadFile( 413): bytes: 389376
D/AsyncDownloadFile( 413): new download seek: 389376; lengthFile: 2000000
D/AsyncDownloadFile( 413): header fields: {p3p=[policyref="http://info.yahoo.co
m/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi
OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA PO
L HEA PRE LOC GOV"], content-type=[application/zip], connection=[close], last-mo
dified=[Fri, 06 Aug 2010 14:47:50 GMT], content-length=[1610624], age=[0], serve
r=[YTS/1.17.13], accept-ranges=[bytes], date=[Sat, 07 Aug 2010 04:39:21 GMT], co
ntent-range=[bytes 389376-1999999/2000000]}
D/AsyncDownloadFile( 413): bytes: 390400
D/AsyncDownloadFile( 413): bytes: 390409
D/AsyncDownloadFile( 413): bytes: 391433
D/AsyncDownloadFile( 413): bytes: 391869
...
@12:44:10 interrupted
D/AsyncDownloadFile( 413): bytes: 775413
D/AsyncDo开发者_开发技巧wnloadFile( 413): bytes: 775849
D/AsyncDownloadFile( 413): bytes: 776873
D/AsyncDownloadFile( 413): bytes: 777309
D/AsyncDownloadFile( 413): new download seek: 777309; lengthFile: 2000000
D/AsyncDownloadFile( 413): header fields: {p3p=[policyref="http://info.yahoo.co
m/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi
OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA PO
L HEA PRE LOC GOV"], content-type=[application/zip], connection=[close], last-mo
dified=[Fri, 06 Aug 2010 14:47:50 GMT], content-length=[1222691], age=[0], serve
r=[YTS/1.17.13], accept-ranges=[bytes], date=[Sat, 07 Aug 2010 04:44:20 GMT], co
ntent-range=[bytes 777309-1999999/2000000]}
D/dalvikvm( 413): GC_FOR_MALLOC freed 10869 objects / 465664 bytes in 122ms
D/AsyncDownloadFile( 413): bytes: 778333
D/AsyncDownloadFile( 413): bytes: 778342
D/AsyncDownloadFile( 413): bytes: 779366
D/AsyncDownloadFile( 413): bytes: 779802
...
@12:49:30 interrupted
D/AsyncDownloadFile( 413): bytes: 1163782
D/AsyncDownloadFile( 413): bytes: 1164806
D/AsyncDownloadFile( 413): bytes: 1165242
D/AsyncDownloadFile( 413): new download seek: 1165242; lengthFile: 2000000
D/AsyncDownloadFile( 413): header fields: {p3p=[policyref="http://info.yahoo.co
m/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi
OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA PO
L HEA PRE LOC GOV"], content-type=[application/zip], connection=[close], last-mo
dified=[Fri, 06 Aug 2010 14:47:50 GMT], content-length=[834758], age=[0], server
=[YTS/1.17.13], accept-ranges=[bytes], date=[Sat, 07 Aug 2010 04:49:43 GMT], con
tent-range=[bytes 1165242-1999999/2000000]}
D/AsyncDownloadFile( 413): bytes: 1166266
D/AsyncDownloadFile( 413): bytes: 1167290
D/AsyncDownloadFile( 413): bytes: 1167718
D/AsyncDownloadFile( 413): bytes: 1168742
...
@12:55:30 interrupted
D/AsyncDownloadFile( 413): bytes: 1552722
D/AsyncDownloadFile( 413): bytes: 1553158
D/AsyncDownloadFile( 413): bytes: 1554182
D/AsyncDownloadFile( 413): bytes: 1554618
D/AsyncDownloadFile( 413): new download seek: 1554618; lengthFile: 2000000
D/AsyncDownloadFile( 413): header fields: {p3p=[policyref="http://info.yahoo.co
m/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi
OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA PO
L HEA PRE LOC GOV"], content-type=[application/zip], connection=[close], last-mo
dified=[Fri, 06 Aug 2010 14:47:50 GMT], content-length=[445382], age=[0], server
=[YTS/1.17.13], accept-ranges=[bytes], date=[Sat, 07 Aug 2010 04:55:39 GMT], con
tent-range=[bytes 1554618-1999999/2000000]}
D/AsyncDownloadFile( 413): bytes: 1555642
D/AsyncDownloadFile( 413): bytes: 1556666
D/AsyncDownloadFile( 413): bytes: 1557094
D/AsyncDownloadFile( 413): bytes: 1558118
...
@12:57:20 interrupted
D/AsyncDownloadFile( 413): bytes: 1941834
D/AsyncDownloadFile( 413): bytes: 1942858
D/AsyncDownloadFile( 413): bytes: 1943882
D/AsyncDownloadFile( 413): bytes: 1943994
D/AsyncDownloadFile( 413): new download seek: 1943994; lengthFile: 2000000
D/AsyncDownloadFile( 413): header fields: {p3p=[policyref="http://info.yahoo.co
m/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi
OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA PO
L HEA PRE LOC GOV"], content-type=[application/zip], connection=[close], last-mo
dified=[Fri, 06 Aug 2010 14:47:50 GMT], content-length=[56006], age=[0], server=
[YTS/1.17.13], accept-ranges=[bytes], date=[Sat, 07 Aug 2010 04:57:15 GMT], cont
ent-range=[bytes 1943994-1999999/2000000]}
D/dalvikvm( 413): GC_FOR_MALLOC freed 13617 objects / 602200 bytes in 165ms
D/AsyncDownloadFile( 413): bytes: 1945018
D/AsyncDownloadFile( 413): bytes: 1946042
D/AsyncDownloadFile( 413): bytes: 1946470
D/AsyncDownloadFile( 413): bytes: 1947494
...
@12:58:10 finished
D/AsyncDownloadFile( 413): bytes: 1996103
D/AsyncDownloadFile( 413): bytes: 1997127
D/AsyncDownloadFile( 413): bytes: 1997563
D/AsyncDownloadFile( 413): bytes: 1998587
D/AsyncDownloadFile( 413): bytes: 1999023
D/onPostExecute( 413): downloaded: unsuccessful
To resume a download, you need to send not only the Range request header, but also the If-Range request header which should contain either the unique file identifier or the file modification timestamp.
If the server returns an ETag response header on the initial download, then you should use it in the If-Range header of the subsequent resume requests. Or if it returns a Last-Modified response header, then you should use it in the If-Range request header instead.
Looking at your logs, the server has sent a Last-Modified response header. So you should send it back along in an If-Range header of the resume request.
// Initial download.
String lastModified = connection.getHeaderField("Last-Modified");
// ...
// Resume download.
connection.setRequestProperty("If-Range", lastModified);
The server will use this information to verify if you're requesting exactly the same file.
Seems that problem is calling
input = new BufferedInputStream(url.openStream(), 8192);
instead of
input = new BufferedInputStream(connection.getInputStream(), 8192);
url.openStream() makes another call to openConnection() WITHOUT the range property.
I managed to implement http resume download on my client Java application, trick was to use "If-Range:original_ETag" request header as mentioned in an accepted answer. Here is a full header debug information it may help you understand how resume works.
Normal reply from server, file is read from the start to the end. ETag value is W/"filesize_bytes-modified_utc" metadata from the disk file. It could be something else but thats what Tomcat uses and usually is best for regular file content.
HTTP/1.1 200 OK
ETag: W/"19097900-1410863319978"
Last-Modified: Tue, 16 Sep 2014 10:28:39 GMT
Content-Length: 19097900
Content-Type: application/octet-stream
Accept-Ranges: bytes
Server: Apache-Coyote/1.1
Date: Wed, 17 Sep 2014 10:39:52 GMT
Client reads a given chunk from the file by adding Range and If-Range headers. Byte range can be open so server should read starting from given index to the end. Note Content-Length is not the total length of file but this chunk of bytes.
Range: bytes=10000000-
If-Range: W/"19097900-1410863319978"
HTTP/1.1 206 Partial Content
ETag: W/"19097900-1410863319978"
Last-Modified: Tue, 16 Sep 2014 10:28:39 GMT
Content-Length: 9097900
Content-Type: application/octet-stream
Accept-Ranges: bytes
Content-Range: bytes 10000000-19097899/19097900
Server: Apache-Coyote/1.1
Date: Wed, 17 Sep 2014 18:12:36 GMT
If remote file was changed then server should not return 206-PartialContent but regular 200-OK reply. Server should use If-Range value to check for consistency. Some clients like VLCPlayer puts Range field without If-Range value.
When client is making an initial request without Range+If-Range headers it may add "If-Modified-Since: modified_http_date" header. Server may return 304-NotModified status and client is done. If client gives byteStartIdx>=filesize then server returns 416-RequestedRangeNotSatisfiable.
Additional debug dumps to clarify how http-resume works.
Range=bytes=0-0
If-Range=W/"19097900-1410863319978"
HTTP/1.1 206 Partial Content
ETag=W/"19097900-1410863319978"
Date=Fri, 19 Sep 2014 12:53:36 GMT
Content-Length=1
Last-Modified=Tue, 16 Sep 2014 10:28:39 GMT
Content-Type=application/octet-stream
Accept-Ranges=bytes
Server=Apache-Coyote/1.1
Content-Range=bytes 0-0/19097900
- - - - -
Range=bytes=19097800-29097800
If-Range=W/"19097900-1410863319978"
HTTP/1.1 206 Partial Content
ETag=W/"19097900-1410863319978"
Date=Fri, 19 Sep 2014 12:59:24 GMT
Content-Length=100
Last-Modified=Tue, 16 Sep 2014 10:28:39 GMT
Content-Type=application/octet-stream
Accept-Ranges=bytes
Server=Apache-Coyote/1.1
Content-Range=bytes 19097800-19097899/19097900
- - - - - - - -
Range=bytes=19097899-19097899
If-Range=W/"19097900-1410863319978"
HTTP/1.1 206 Partial Content
ETag=W/"19097900-1410863319978"
Date=Fri, 19 Sep 2014 13:01:47 GMT
Content-Length=1
Last-Modified=Tue, 16 Sep 2014 10:28:39 GMT
Content-Type=application/octet-stream
Accept-Ranges=bytes
Server=Apache-Coyote/1.1
Content-Range=bytes 19097899-19097899/19097900
加载中,请稍侯......
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