when disconnecting, clean up the header chunk so subsequent clients don't get a potentially incorrect initialization segment

CHANGELOG.md

@@ -1,3 +1,6 @@
+## v0.3.1-dev
+- forget a channel's initialization segment when no transmitter is active. This improves behavior when a channel is occasionally used for streams with different codecs.
+
 ## v0.3.0
 - update internals to v0.2 of `warp` and `tokio`; no remaining code relies on `futures` 0.1
 

Cargo.lock

@@ -1227,7 +1227,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "webmetro"
-version = "0.3.0-dev"
+version = "0.3.1-dev"
 dependencies = [
  "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "webmetro"
-version = "0.3.0-dev"
+version = "0.3.1-dev"
 authors = ["Tangent 128 <Tangent128@gmail.com>"]
 edition = "2018"
 

src/channel.rs

@@ -57,6 +57,16 @@ impl Transmitter {
     }
 }
 
+impl Drop for Transmitter {
+    fn drop(&mut self) {
+        if let Ok(mut channel) = self.channel.lock() {
+            // when disconnecting, clean up the header chunk so subsequent
+            // clients don't get a potentially incorrect initialization segment
+            channel.header_chunk = None;
+        }
+    }
+}
+
 pub struct Listener {
     /// not used in operation, but its refcount keeps the channel alive when there's no Transmitter
     _channel: Handle,