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Is there any way to send back custom responses from varnish itself?
if (req.url ~ "^/hello") {
return "hello world";
}
896
You would do this with a synthetic response. For example:
sub vcl_recv {
if (req.url ~ "^/hello") {
error 700 "OK";
}
}
sub vcl_error {
if (obj.status == 700) {
set obj.http.Content-Type = "text/html; charset=utf-8";
set obj.status = 200;
synthetic {"
<html>
<head>
<title>Hello!</title>
</head>
<body>
<h1>Hello world!</h1>
</body>
</html>
"};
}
}
I think the preferred way to do this in Varnish 4 via the vcl_synth subroutine:
sub vcl_recv {
if (req.url ~ "^/hello") {
# We set a status of 750 and use the synth subroutine
return (synth(750));
}
}
sub vcl_synth {
if (resp.status == 750) {
# Set a status the client will understand
set resp.status = 200;
# Create our synthetic response
synthetic("hello world");
return(deliver);
}
}
There's some more info about the built-in subroutines at:
http://book.varnish-software.com/4.0/chapters/VCL_Built_in_Subroutines.html#vcl-vcl-synth
37
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