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<p class="MsoNormal"><span lang="EN-US">Hello there,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I have the following issue with squid (squid-3.5.20-12.el7_6.1.x86_64 on RHEL 7.6)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">A client requests a json with “no-cache” header via proxy.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Squid forwards the request to origin server, which replies with “ETag” header (object is cachable).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Squid stores the object in cache_dir and forwards back to the client.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The client is pushing same request at high rate (~10/sec), regardless its cachable status.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Squid keeps forwarding the request and – here is my issue – keeps storing the same identical object on disk.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I have thousands of copies of the same Etag on disk.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Is there a way to avoid this? I think Squid should store a single copy per-URL/ETAg of the object.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’d like to avoid an ad-hoc reload-into-ims refresh-pattern.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Here’s an example of headers sequence:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console""><o:p> </o:p></span></p>
<ol style="margin-top:0cm" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:-18.0pt;mso-list:l0 level1 lfo1">
<b><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">CLIENT
</span></b><span lang="EN-US" style="font-family:Wingdings">à</span><b><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console""> SQUID<o:p></o:p></span></b></li></ol>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">GET http://xxx.xxx.xxx.xxx/blah/FEED.json HTTP/1.1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Accept-Encoding: gzip<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-US; rv:1.9.2.2) Gecko/20100316 Firefox/3.6.2<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Content-Language: en-US<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Cache-Control: no-cache<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Pragma: no-cache<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Host: xxx.xxx.xxx.xxx<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Proxy-Connection: keep-alive<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console""><o:p> </o:p></span></p>
<ol style="margin-top:0cm" start="2" type="1">
<li class="MsoListParagraph" style="margin-left:-18.0pt;mso-list:l0 level1 lfo1">
<b><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">SQUID </span>
</b><span lang="EN-US" style="font-family:Wingdings">à</span><b><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console""> ORIGIN SERVER<o:p></o:p></span></b></li></ol>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">GET /blah/FEED.json HTTP/1.1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Accept-Encoding: gzip<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-US; rv:1.9.2.2) Gecko/20100316 Firefox/3.6.2<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Content-Language: en-US<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Pragma: no-cache<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Host: xxx.xxx.xxx.xxx<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Via: 1.1 RP-PRXSQUID-2 (squid/3.5.20)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">X-Forwarded-For: unknown<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Cache-Control: no-cache<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Connection: keep-alive<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console""><o:p> </o:p></span></p>
<ol style="margin-top:0cm" start="3" type="1">
<li class="MsoListParagraph" style="margin-left:-18.0pt;mso-list:l0 level1 lfo1">
<b><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">ORIGIN SERVER
</span></b><span lang="EN-US" style="font-family:Wingdings">à</span><b><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console""> SQUID<o:p></o:p></span></b></li></ol>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">HTTP/1.1 200 OK<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Server: Apache/2.2.16 (Debian)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Last-Modified: Fri, 26 Jun 2020 11:46:00 GMT<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">ETag: "62b905-a7cfa-5a8fb40bdee00"<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Accept-Ranges: bytes<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Content-Length: 687354<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Keep-Alive: timeout=4, max=45<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Connection: Keep-Alive<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Content-Type: text/plain<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console""><o:p> </o:p></span></p>
<ol style="margin-top:0cm" start="4" type="1">
<li class="MsoListParagraph" style="margin-left:-18.0pt;mso-list:l0 level1 lfo1">
<b><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">SQUID </span>
</b><span lang="EN-US" style="font-family:Wingdings">à</span><b><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console""> CLIENT<o:p></o:p></span></b></li></ol>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">HTTP/1.1 200 OK<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Date: Fri, 26 Jun 2020 11:52:15 GMT<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Server: Apache/2.2.16 (Debian)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Last-Modified: Fri, 26 Jun 2020 11:46:00 GMT<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">ETag: "62b905-a7cfa-5a8fb40bdee00"<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Accept-Ranges: bytes<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Content-Length: 687354<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Content-Type: text/plain<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">X-Cache: MISS from RP-PRXSQUID-2<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">X-Cache-Lookup: HIT from RP-PRXSQUID-2:3128<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Via: 1.1 RP-PRXSQUID-2 (squid/3.5.20)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Lucida Console"">Connection: keep-alive<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">ST<o:p></o:p></span></p>
</div>
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