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cmd/reverse_proxy: Add --change-host-header flag

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"Transparent mode" is the default, just like the actual handler.
This commit is contained in:
Matthew Holt 2020-02-27 20:52:41 -07:00
parent ca5c679880
commit 0130b699df
1 changed files with 15 additions and 6 deletions
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21
modules/caddyhttp/reverseproxy/command.go
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@ -36,7 +36,7 @@ func init() {
caddycmd.RegisterCommand(caddycmd.Command{ caddycmd.RegisterCommand(caddycmd.Command{
Name: "reverse-proxy", Name: "reverse-proxy",
Func: cmdReverseProxy, Func: cmdReverseProxy,
Usage: "[--from <addr>] [--to <addr>]", Usage: "[--from <addr>] [--to <addr>] [--change-host-header]",
Short: "A quick and production-ready reverse proxy", Short: "A quick and production-ready reverse proxy",
Long: ` Long: `
A simple but production-ready reverse proxy. Useful for quick deployments, A simple but production-ready reverse proxy. Useful for quick deployments,
@ -46,11 +46,16 @@ Simply shuttles HTTP traffic from the --from address to the --to address.
If the --from address has a domain name, Caddy will attempt to serve the If the --from address has a domain name, Caddy will attempt to serve the
proxy over HTTPS with a certificate. proxy over HTTPS with a certificate.
If --change-host-header is set, the Host header on the request will be modified
from its original incoming value to the address of the upstream. (Otherwise, by
default, all incoming headers are passed through unmodified.)
`, `,
Flags: func() *flag.FlagSet { Flags: func() *flag.FlagSet {
fs := flag.NewFlagSet("file-server", flag.ExitOnError) fs := flag.NewFlagSet("file-server", flag.ExitOnError)
fs.String("from", "", "Address to receive traffic on") fs.String("from", "", "Address on which to receive traffic")
fs.String("to", "", "Upstream address to proxy traffic to") fs.String("to", "", "Upstream address to which to to proxy traffic")
fs.Bool("change-host-header", false, "Set upstream Host header to address of upstream")
return fs return fs
}(), }(),
}) })
@ -59,6 +64,7 @@ proxy over HTTPS with a certificate.
func cmdReverseProxy(fs caddycmd.Flags) (int, error) { func cmdReverseProxy(fs caddycmd.Flags) (int, error) {
from := fs.String("from") from := fs.String("from")
to := fs.String("to") to := fs.String("to")
changeHost := fs.Bool("change-host-header")
if from == "" { if from == "" {
from = "localhost:" + httpcaddyfile.DefaultPort from = "localhost:" + httpcaddyfile.DefaultPort
@ -97,13 +103,16 @@ func cmdReverseProxy(fs caddycmd.Flags) (int, error) {
handler := Handler{ handler := Handler{
TransportRaw: caddyconfig.JSONModuleObject(ht, "protocol", "http", nil), TransportRaw: caddyconfig.JSONModuleObject(ht, "protocol", "http", nil),
Upstreams: UpstreamPool{{Dial: toURL.Host}}, Upstreams: UpstreamPool{{Dial: toURL.Host}},
Headers: &headers.Handler{ }
if changeHost {
handler.Headers = &headers.Handler{
Request: &headers.HeaderOps{ Request: &headers.HeaderOps{
Set: http.Header{ Set: http.Header{
"Host": []string{"{http.reverse_proxy.upstream.host}"}, "Host": []string{"{http.reverse_proxy.upstream.hostport}"},
}, },
}, },
}, }
} }
route := caddyhttp.Route{ route := caddyhttp.Route{