Skip to content

Instantly share code, notes, and snippets.

@aondio

aondio/goto and 404 and 503 checks

Created March 8, 2021 11:47
Show Gist options

  • Select an option

    Learn more about clone URLs
  • Save aondio/4c054c6d058b2e2f4dc080fb47cec0e3 to your computer and use it in GitHub Desktop.

Select an option

Learn more about clone URLs
Save aondio/4c054c6d058b2e2f4dc080fb47cec0e3 to your computer and use it in GitHub Desktop.
Download ZIP

Revisions

  1. aondio created this gist Mar 8, 2021.
    76 changes: 76 additions & 0 deletions goto and 404 and 503 checks
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,76 @@
    varnishtest "Goto and fallbacks"

    server s1 {
    rxreq
    txresp -hdr "backend:s1"
    expect req.url == "/client"

    rxreq
    txresp -status 404 -hdr "backend:s1"

    rxreq
    txresp -status 503 -hdr "backend:s1"

    rxreq
    txresp -hdr "backend:s1"
    expect req.url == "/client"
    } -start

    server s2 {
    rxreq
    txresp -hdr "backend:s2"
    expect req.url == "/fallback-404"

    rxreq
    txresp -hdr "backend:s2"
    expect req.url == "/fallback-503"
    } -start

    varnish v1 -vcl {
    import directors;
    import goto;

    backend default none;

    sub vcl_init {
    new s1 = goto.dns_director("${s1_addr}:${s1_port}");
    new s2 = goto.dns_director("${s2_addr}:${s2_port}");
    }

    sub vcl_recv {
    set req.backend_hint = s1.backend();
    return (pass);
    }

    sub vcl_backend_response {
    if (beresp.status == 404 || beresp.status >= 500) {
    set bereq.backend = s2.backend();
    return(retry);

    }
    }
    } -start

    delay 1.0

    client c1 {
    txreq -url "/client"
    rxresp
    expect resp.status == 200
    expect resp.http.backend == "s1"

    txreq -url "/fallback-404"
    rxresp
    expect resp.status == 200
    expect resp.http.backend == "s2"

    txreq -url "/fallback-503"
    rxresp
    expect resp.status == 200
    expect resp.http.backend == "s2"

    txreq -url "/client"
    rxresp
    expect resp.status == 200
    expect resp.http.backend == "s1"
    } -run