On Tue, Jul 22, 2014 at 7:13 AM, Tobias Honacker
<[email protected]> wrote:
> if ( (obj.status >= 500 || obj.status <= 505) && (req.url ~ "^/appserver/")
> ) {
> set obj.http.Cache-Control = "public, max-age=10";
> set obj.status = 200;
> set obj.response = "OK";
> return (deliver);
> }
>
> we are aiming to serve a blank 200 status so that the error disappear on our
> site where the ESI is included.
>
> how could we fix that issue? is there any way not using synthetic while
> serving blank html code? i dont like this "workaround".
Hello,
You can throw a custom error in the VCL, and catch it in vcl_error to
serve blank synthetic content:
if ( (obj.status >= 500 || obj.status <= 505) && (req.url ~ "^/appserver/") ) {
error 942 "Backend down";
return (deliver);
}
sub vcl_error {
if (obj.status == 942) {
set obj.http.Cache-Control = "public, max-age=10";
set obj.status = 200;
set obj.response = "OK";
synthetic "";
return (deliver);
}
}
Please note however than when varnish delivers content from vcl_error,
it sends a Connection: close header, which can make things slower
since the client will have to re-establish the connection for further
requests.
--
Thomas Lecomte
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