Lighttpd

I have a very small footprint Ubuntu server that lighttpd is perfect for. The one additional thing I would like to do, to forward requests of the form http://mysite.tld:5678/myonionaddress.onion to my proxy at localhost:9050. I was thinking this might be possible in mod_proxy with map-host-request and map-urlpath, but wasn't sure if its possible to add a header such as Proxy-Connection: Keep-Alive.

Incoming request to myhost.tld:5678

GET /myonionaddress.onion/ HTTP/1.1
Host: myhost.tld:5678
User-Agent: curl/7.58.0
Accept: */*

Desired request to proxy at localhost:9050

GET http://myonionaddress.onion/ HTTP/1.1
Host: myonionaddress.onion
User-Agent: curl/7.58.0
Accept: */*
Proxy-Connection: Keep-Alive

My best-guess config

$SERVER["socket"] == ":5678" {
  $HTTP["url"] =~ "^/myonionaddress.onion" {
    proxy.server = ( "" => ( ( "host" => "127.0.0.1", "port" => "9050" ) ) )
    proxy.header =
      ( 
        "map-host-request" => ( "Host: myhost.tld:5678" => "Host: myonionaddress.onion" ),
        "map-urlpath"      => ( "/myonionaddress.onion/" => "http://myonionaddress.onion/" )
      )
  }
}

Question¶

1. Are map-urlpath remaps freeform or do they need to start with a / (backslash)?
2. Is there any way to add the Proxy-Connection: Keep-Alive header?
3. If this is ridiculous and using the wrong tool, can you recommend any light weight tools to do the same?

Answers (update)¶

1. They are freeform and do not need to start with /.
2. Nope... not that I can find.

Working Config (note I did need to proxy through privoxy to downgrade the SOCKS proxy to a standard HTTP proxy

$SERVER["socket"] == ":5678" {
  $HTTP["url"] =~ "^/myonionaddress.onion" {
    proxy.server = ( "" => ( ( "host" => "127.0.0.1", "port" => "8118" ) ) )
    proxy.header = ( "map-urlpath" => ( "/myonionaddress.onion/" => "http://myonionaddress.onion/" ))
    setenv.set-request-header = ( "Host" => "myonionaddress.onion" )
  }
}

SysInfo¶

• Ubuntu 18.04.1 LTS (Bionic Beaver)
• Kernel 4.15.0-1021-gcp x86_64 (packaged with bionic)
• lighttpd 1.4.45-1ubuntu3 bionic in /usr/sbin
• Client: curl/7.58.0