我有一个小程序，它在一个特定的环境中循环获取。
这会导致超时和失败。
这是来自控制台的日志：
Java Plug-in 11.201.2.09 x86
Using JRE version 1.8.0_201-b09 Java HotSpot(TM) Client VM
User home directory = C:\Users\User
----------------------------------------------------
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
----------------------------------------------------
basic: Added progress listener: sun.plugin.util.ProgressMonitorAdapter@5683f8
basic: Plugin2ClassLoader.addURL parent called for https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766
basic: Plugin2ClassLoader.addURL parent called for https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922
network: Cache entry not found [url: file:/C:/Program%20Files%20(x86)/Java/jre1.8.0_201/lib/ext/sunec.jar, version: null]
network: Cache entry not found [url: https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766, version: null]
network: Connecting https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766 with proxy=DIRECT
network: Connecting http://my-site.com:443/ with proxy=DIRECT
network: Cache entry not found [url: file:/C:/Program%20Files%20(x86)/Java/jre1.8.0_201/lib/ext/sunjce_provider.jar, version: null]
security: Loading SSL Root CA certificates from C:\Program Files (x86)\Java\jre1.8.0_201\lib\security\cacerts
security: Loaded SSL Root CA certificates from C:\Program Files (x86)\Java\jre1.8.0_201\lib\security\cacerts
security: Obtain certificate collection in SSL Root CA certificate store
security: Obtain certificate collection in SSL Root CA certificate store
security: Loading certificates from Deployment session certificate store
security: Loaded certificates from Deployment session certificate store
security: Loading certificates from Internet Explorer ROOT certificate store
security: Loaded certificates from Internet Explorer ROOT certificate store
security: Loading certificates from Internet Explorer DISALLOWED certificate store
security: Loaded certificates from Internet Explorer DISALLOWED certificate store
security: Loaded blacklisted.certs file: C:\Users\User\AppData\LocalLow\Sun\Java\Deployment\security\blacklisted.certs
security: SHA-256Certificate finger print: 1FC0E889AFEA322E6B71DB8BEBD02F86CA3F4B93BB772A0544911E7D611FA1B5
security: Checking if certificate is in Internet Explorer DISALLOWED certificate store
security: SHA-256Certificate finger print: 973A41276FFD01E027A2AAD49E34C37846D3E976FF6A620B6712E33832041AA6
security: Checking if certificate is in Internet Explorer DISALLOWED certificate store
security: Checking if SSL certificate is in Deployment permanent certificate store
security: Loading certificates from Internet Explorer ROOT certificate store
security: Loaded certificates from Internet Explorer ROOT certificate store
security: Loading certificates from Deployment session certificate store
security: Loaded certificates from Deployment session certificate store
network: Connecting http://ocsp.godaddy.com/ with proxy=DIRECT
network: Connecting http://ocsp.godaddy.com:80/ with proxy=DIRECT
security: OCSP Response: GOOD
network: Connecting http://ocsp.godaddy.com/ with proxy=DIRECT
network: Connecting http://ocsp.godaddy.com:80/ with proxy=DIRECT
security: OCSP Response: GOOD
security: Saving certificates in Deployment session certificate store
security: Saved certificates in Deployment session certificate store
network: Connecting https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766 with cookie "_ga=GA1.2.1486608597.1547820949; ASP.NET_SessionId=tgsmzpfbzw4iygp24ojjy41s; _gid=GA1.2.1872343802.1548066135; .ASPXAUTH=DFHFDSFSDFD; update-token=true"
network: Cache entry not found [url: https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766, version: null]
network: Cache entry not found [url: https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766, version: null]
network: Cache entry not found [url: https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766, version: null]
network: Connecting https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766 with proxy=DIRECT
network: Connecting https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766 with cookie "_ga=GA1.2.1486608597.1547820949; ASP.NET_SessionId=tgsmzpfbzw4iygp24ojjy41s; _gid=GA1.2.1872343802.1548066135; .ASPXAUTH=DFHFDSFSDFD; update-token=true"
network: ResponseCode for https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766 : 200
network: Encoding for https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766 : null
network: Server response: (length: 15333, lastModified: Mon Jan 21 10:15:24 EET 2019, downloadVersion: null, mimeType: application/java-archive)
network: Downloading resource: https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766
Content-Length: 15,333
Content-Encoding: null
network: Wrote URL https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766 to File C:\Users\User\AppData\Local\Temp\jar_cache935836637493273617.tmp
security: Blacklist revocation check is enabled
security: blacklist: Reconstruct cache
security: blacklist: created: NEED_CREATE, lastModified: 1548066212673
security: blacklist: check contains esOBJLzwpYxArxuni3f54/WHl+Jmi2EsiVyuwAwHbCc=, state now NEED_CREATE
security: blacklist: check raw C:\Users\User\AppData\LocalLow\Sun\Java\Deployment\security\blacklist.dynamic, false
security: blacklist: check raw C:\Program Files (x86)\Java\jre1.8.0_201\lib\security\blacklist, false
security: blacklist: check raw C:\Users\User\AppData\LocalLow\Sun\Java\Deployment\security\blacklist, false
security: blacklist: save cache to C:\Users\User\AppData\LocalLow\Sun\Java\Deployment\cache\security\blacklist.cache
security: blacklist: check contains esOBJLzwpYxArxuni3f54/WHl+Jmi2EsiVyuwAwHbCc=, state now IN_MEMORY
security: blacklist: not found in cache
security: Trusted libraries list check is enabled
security: Trusted libraries list file not found
security: blacklist: check contains esOBJLzwpYxArxuni3f54/WHl+Jmi2EsiVyuwAwHbCc=, state now IN_MEMORY
security: blacklist: not found in cache
security: blacklist: check contains esOBJLzwpYxArxuni3f54/WHl+Jmi2EsiVyuwAwHbCc=, state now IN_MEMORY
security: blacklist: not found in cache
network: Disconnect connection to https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766
network: Downloaded https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766: C:\Users\User\AppData\Local\Temp\jar_cache935836637493273617.tmp
cache: Adding MemoryCache entry: https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766
cache: registerReference: com.sun.deploy.cache.MemoryCache$CachedResourceReference@eb2b4ba5: 1
network: Connecting https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766 with proxy=DIRECT
network: Connecting https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766 with cookie "_ga=GA1.2.1486608597.1547820949; ASP.NET_SessionId=tgsmzpfbzw4iygp24ojjy41s; _gid=GA1.2.1872343802.1548066135; .ASPXAUTH=DFHFDSFSDFD; update-token=true"
network: Connecting https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766 with proxy=DIRECT
network: Connecting https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766 with cookie "_ga=GA1.2.1486608597.1547820949; ASP.NET_SessionId=tgsmzpfbzw4iygp24ojjy41s; _gid=GA1.2.1872343802.1548066135; .ASPXAUTH=DFHFDSFSDFD; update-token=true"
security: Grant connect perm for https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766 : java.security.Permissions@1c518b1 (
("java.net.URLPermission" "https://my-site.com:443/-" "*:*")
("java.net.URLPermission" "https://my-site.com:443" "*:*")
)
security: Expected Main URL: https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766
security: Missing Codebase manifest attribute for: https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766
security: Missing Application-Library-Allowable-Codebase manifest attribute for: https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766
security: Loading Deployment certificates from C:\Users\User\AppData\LocalLow\Sun\Java\Deployment\security\trusted.certs
security: Loaded Deployment certificates from C:\Users\User\AppData\LocalLow\Sun\Java\Deployment\security\trusted.certs
security: Loading certificates from Deployment session certificate store
security: Loaded certificates from Deployment session certificate store
security: Loading certificates from Deployment session certificate store
security: Loaded certificates from Deployment session certificate store
security: Loading certificates from Deployment session certificate store
security: Loaded certificates from Deployment session certificate store
security: Loading certificates from Deployment session certificate store
security: Loaded certificates from Deployment session certificate store
security: Loading certificates from Internet Explorer TrustedPublisher certificate store
security: Loaded certificates from Internet Explorer TrustedPublisher certificate store
security: Loading certificates from Internet Explorer DISALLOWED certificate store
security: Loaded certificates from Internet Explorer DISALLOWED certificate store
security: Validate the certificate chain using CertPath API
security: Timestamping info is available
security: Start checking TSA certificate path
security: Loading certificates from Internet Explorer ROOT certificate store
security: Loaded certificates from Internet Explorer ROOT certificate store
security: The OCSP support is enabled
security: The CRL support is enabled
network: Connecting http://ocsp.digicert.com/ with proxy=DIRECT
network: Connecting http://ocsp.digicert.com:80/ with proxy=DIRECT
security: OCSP Response: GOOD
network: Connecting http://ocsp.digicert.com/ with proxy=DIRECT
security: OCSP Response: GOOD
security: Certificate validation succeeded using OCSP/CRL
security: Saving certificates in Deployment session certificate store
security: Saved certificates in Deployment session certificate store
security: The certificate was timestamped in valid period
security: SHA-256Certificate finger print: 08D7D1288EAA5824B1824246131B85348DFC3A4D9476418B0AA80605577D74CC
security: Checking if certificate is in Internet Explorer DISALLOWED certificate store
security: SHA-256Certificate finger print: 51044706BD237B91B89B781337E6D62656C69F0FCFFBE8E43741367948127862
security: Checking if certificate is in Internet Explorer DISALLOWED certificate store
security: SHA-256Certificate finger print: 3E9099B5015E8F486C00BCEA9D111EE721FABA355A89BCF1DF69561E3DC6325C
security: Checking if certificate is in Internet Explorer DISALLOWED certificate store
security: SHA-256Certificate finger print: 3E9099B5015E8F486C00BCEA9D111EE721FABA355A89BCF1DF69561E3DC6325C
security: Checking if certificate is in Internet Explorer DISALLOWED certificate store
security: The OCSP support is enabled
security: The CRL support is enabled
network: Connecting http://ocsp.digicert.com/ with proxy=DIRECT
security: OCSP Response: GOOD
network: Connecting http://ocsp.digicert.com/ with proxy=DIRECT
security: OCSP Response: GOOD
security: Certificate validation succeeded using OCSP/CRL
security: Saving certificates in Deployment session certificate store
security: Saved certificates in Deployment session certificate store
security: Saving certificates in Deployment session certificate store
security: Saved certificates in Deployment session certificate store
security: Verifying permission attribute in main jar: https://my-site.com/Applets/PDFViewer/loaderapplet.jar?v=7766
basic: Plugin2ClassLoader.getPermissions CeilingPolicy allPerms
security: Timestamping info is available
security: Start checking TSA certificate path
security: The certificate was timestamped in valid period
security: SSV validation:
running: 1.8.0_201
requested: null
range: null
javaVersionParam: null
Rule Set version: null
network: Created version ID: 1.8.0.201
network: Created version ID: 1.8.0.201
security: continue with running version
security: JUT Record:
plugin2
https://my-site.com/Doc?dt=7458381155999161: launchjnlp= codebase_lookup=false code=pdfViewerApplet.PDFViewerApplet printallowed=true codebase=https://my-site.com/ progressbar=true width=854 archive=/Applets/PDFViewer/loaderapplet.jar?v=7766,/Applets/PDFViewer/MainS.jar?v=5922 java_arguments=LVhteDUxMm0A browseallowed=false url=https://my-site.com/dochandler/file?dt=f0f950fc40fc45f6b7128c4642320f0c height=804 app_model=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
network: Cache entry not found [url: https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922, version: null]
network: Connecting https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 with proxy=DIRECT
network: Connecting http://my-site.com:443/ with proxy=DIRECT
network: Connecting https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 with cookie "_ga=GA1.2.1486608597.1547820949; ASP.NET_SessionId=tgsmzpfbzw4iygp24ojjy41s; _gid=GA1.2.1872343802.1548066135; .ASPXAUTH=DFHFDSFSDFD; update-token=true"
network: Cache entry not found [url: https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922, version: null]
network: Cache entry not found [url: https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922, version: null]
network: Cache entry not found [url: https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922, version: null]
network: Connecting https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 with proxy=DIRECT
network: Connecting https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 with cookie "_ga=GA1.2.1486608597.1547820949; ASP.NET_SessionId=tgsmzpfbzw4iygp24ojjy41s; _gid=GA1.2.1872343802.1548066135; .ASPXAUTH=DFHFDSFSDFD; update-token=true"
network: ResponseCode for https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 : 200
network: Encoding for https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 : null
network: Server response: (length: 2279469, lastModified: Mon Jan 21 10:15:24 EET 2019, downloadVersion: null, mimeType: application/java-archive)
network: Downloading resource: https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922
Content-Length: 2,279,469
Content-Encoding: null
network: Wrote URL https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 to File C:\Users\User\AppData\Local\Temp\jar_cache6536774915285277590.tmp
security: blacklist: check contains XKSetBrYXonRTC11oCiQZRZxazUd86naesuBayCY3hc=, state now IN_MEMORY
security: blacklist: not found in cache
security: blacklist: check contains XKSetBrYXonRTC11oCiQZRZxazUd86naesuBayCY3hc=, state now IN_MEMORY
security: blacklist: not found in cache
security: Trusted libraries list file not found
security: blacklist: check contains XKSetBrYXonRTC11oCiQZRZxazUd86naesuBayCY3hc=, state now IN_MEMORY
security: blacklist: not found in cache
security: blacklist: check contains XKSetBrYXonRTC11oCiQZRZxazUd86naesuBayCY3hc=, state now IN_MEMORY
security: blacklist: not found in cache
network: Disconnect connection to https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922
network: Downloaded https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922: C:\Users\User\AppData\Local\Temp\jar_cache6536774915285277590.tmp
cache: Adding MemoryCache entry: https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922
cache: registerReference: com.sun.deploy.cache.MemoryCache$CachedResourceReference@7878cbae: 1
network: Connecting https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 with proxy=DIRECT
network: Connecting http://my-site.com:443/ with proxy=DIRECT
network: Connecting https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 with cookie "_ga=GA1.2.1486608597.1547820949; ASP.NET_SessionId=tgsmzpfbzw4iygp24ojjy41s; _gid=GA1.2.1872343802.1548066135; .ASPXAUTH=DFHFDSFSDFD; update-token=true"
security: Grant connect perm for https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 : java.security.Permissions@467fb8 (
("java.net.URLPermission" "https://my-site.com:443/-" "*:*")
("java.net.URLPermission" "https://my-site.com:443" "*:*")
)
security: Missing Codebase manifest attribute for: https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922
security: Missing Application-Library-Allowable-Codebase manifest attribute for: https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922
security: Validate the certificate chain using CertPath API
security: Timestamping info is available
security: Start checking TSA certificate path
security: The certificate was timestamped in valid period
basic: Plugin2ClassLoader.getPermissions CeilingPolicy allPerms
security: Timestamping info is available
security: Start checking TSA certificate path
security: The certificate was timestamped in valid period
basic: Applet loaded.
basic: Applet resized and added to parent container
basic: PERF: AppletExecutionRunnable - applet.init() BEGIN ; jvmLaunch dt 238467 us, pluginInit dt 30410100 us, TotalTime: 30648567 us
network: Connecting https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 with proxy=DIRECT
network: Connecting https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 with cookie "_ga=GA1.2.1486608597.1547820949; ASP.NET_SessionId=tgsmzpfbzw4iygp24ojjy41s; _gid=GA1.2.1872343802.1548066135; .ASPXAUTH=DFHFDSFSDFD; update-token=true"
network: Connecting https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 with proxy=DIRECT
[....repeating the above many times here...]
network: Connecting https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 with proxy=DIRECT
network: Connecting https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 with cookie "ASP.NET_SessionId=tgsmzpfbzw4iygp24ojjy41s; .ASPXAUTH=SDFSDHFDSF; update-token=true; topbarsmallmenu=false"
basic: Applet initialized
basic: Starting applet
basic: completed perf rollup
network: Connecting https://my-site.com/dochandler/file?dt=f0f950fc40fc45f6b7128c4642320f0c with proxy=DIRECT
network: Connecting https://my-site.com/dochandler/file?dt=f0f950fc40fc45f6b7128c4642320f0c with cookie "ASP.NET_SessionId=tgsmzpfbzw4iygp24ojjy41s; .ASPXAUTH=SDFSDHFDSF; update-token=true; topbarsmallmenu=false"
network: Connecting https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 with proxy=DIRECT
network: Connecting https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 with cookie "ASP.NET_SessionId=tgsmzpfbzw4iygp24ojjy41s; .ASPXAUTH=SDFSDHFDSF; update-token=true; topbarsmallmenu=false"
network: Connecting https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 with proxy=DIRECT
network: Connecting https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 with cookie "ASP.NET_SessionId=tgsmzpfbzw4iygp24ojjy41s; .ASPXAUTH=SDFSDHFDSF; update-token=true; topbarsmallmenu=false"
basic: Applet made visible
basic: Applet started
basic: Told clients applet is started
请注意结尾处的多个网络匹配：
network: Connecting https://my-site.com/Applets/PDFViewer/MainS.jar?v=5922 with proxy=
在其他环境中，它似乎可以正常工作（在同一applet和同一浏览器上）。
有人看到过这样的东西吗？
任何想法出了什么问题？
注意：从浏览器下载JAR文件不会出现问题。
最佳答案
原来这是由服务器添加标题Cache-Control: no-cache, no-store引起的。
这似乎使Java做疯狂的事情...
我也在使用deployJava.js库，但是我怀疑这有什么区别。
关于java - Java小程序被重复获取，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/54289025/