That is what NCBI told us about :
Resolving Page Expired Error Message in PubMed
NCBI is using HTTP1.1 compression/content encoding with Entrez
databases (e.g., PubMed). Data compression allows data to be sent
faster - a big help for users who have slower connections.
Most recent versions of popular browsers are by default enabled to use
HTTP1.1. If, however, users see the message, "Warning: Page has
Expired," after using the back button in their browser, they should
enable HTTP1.1 compression in their browser. The steps to enable
HTTP1.1 compression in Microsoft® Internet Explorer (MSInternet
Explorer) are:
>From the Tools menu, select Internet Options.
Click the Advanced Tab.
Scroll down to HTTP1.1 settings.
Check the following checkboxes: Use HTTP1.1 and Use HTTP1.1 via proxy
connections.
Click OK.
Close MSInternet Explorer and re-open it.
If, after enabling HTTP1.1 compression (be sure to close and re-launch
the browser), users still see the "Warning: Page has Expired" message,
it is possible that another application is responsible. For example,
we have determined that, even with HTTP1.1 compression enabled,
Symantec's firewall program, Norton Internet Security™ can cause the
browser to display the error message if the firewall is configured to
monitor HTTP connections, which is the default configuration.
If, in the case of a firewall program, users wish to disable HTTP
monitoring, they should fully understand the consequences of doing so.
We suggest users either consult the product documentation or contact
the vendor.
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