add proxy hostname to response (but this isn't elegant/safe)

Cargo.lock

@@ -225,6 +225,17 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "hostname"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c731c3e10504cc8ed35cfe2f1db4c9274c3d35fa486e3b31df46f068ef3e867"
+dependencies = [
+ "libc",
+ "match_cfg",
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "http"
 version = "0.2.1"
@@ -350,6 +361,12 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "match_cfg"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ffbee8634e0d45d258acb448e7eaab3fce7a0a467395d4d9f228e3c1f01fb2e4"
+
 [[package]]
 name = "memchr"
 version = "2.3.3"
@@ -795,11 +812,12 @@ checksum = "e604eb7b43c06650e854be16a2a03155743d3752dd1c943f6829e26b7a36e382"
 
 [[package]]
 name = "tts-service-proxy"
-version = "0.0.1"
+version = "0.0.2"
 dependencies = [
  "anyhow",
  "env_logger",
  "futures",
+ "hostname",
  "hyper",
  "hyper-reverse-proxy",
  "log",