[squid-users] How to enable caching for https websites on Squid

Sekar Duraisamy sekarit at gmail.com
Tue Jan 9 11:45:40 UTC 2018

Hi Amos,

Thanks for your information

"To cache encryption protected content you must first remove the
encryption. That destroys the "anonymous" part completely."

Could you please provide little more details about affecting anonymous
service. Do you meant it will affect customers anonymous or from proxy

We used to disable via and forwarded_for header to make squid proxy as
anonymous in HTTP.

When we use certificate in the Proxy server to decrypt the content of
HTTPS, multiple customers will hit to the same HTTPS website in a day
through our proxy, that website always see single certificate even
though multiple customers from multiple IPs. Is there a chance from
website can block
because of they will see more requests from more IP's but single
certificate for the all the requests to the same doamin ?

On Wed, Dec 20, 2017 at 8:42 PM, Amos Jeffries <squid3 at treenet.co.nz> wrote:
> On 21/12/17 02:41, Matus UHLAR - fantomas wrote:
>>> On 21/12/17 01:23, Matus UHLAR - fantomas wrote:
>>>> and I think you should read the last paragraph as:
>>>>  "caching often will not happen, since most of web developers don't know
>>>> hot
>>>>   so use and benefit of it thus they try to disable caching globally"
>> On 21.12.17 02:20, Amos Jeffries wrote:
>>> That is nothing special for HTTPS, it happens worse in regular HTTP.
>> do you want to say that breaking into https can cause http caching more
>> efficient?
>> do you have any evidence of that?
> No, I am saying that the problem you pointed at is a _larger_ problem in
> http:// because those dev are having to actively prevent caching. Many are
> also under the false impression that https:// goes end-to-end and caching
> does not happen there other than Browser cache. So those who develop sites
> with HTTPS in mind do not go to quite such extremes to block proxies
> caching.
> HTTPS has _other_ problems that impact on caching efficiency.
> Amos
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