feat: use X-Request-Body-Stream header for streaming uploads

Transfer-Encoding: chunked is stripped by HTTP/2+ proxies (Cloudflare).
Use a custom X-Request-Body-Stream header as the opt-in signal for
streaming request bodies.

Author: max-lt

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "openworkers-runner"
-version = "0.14.2"
+version = "0.14.3"
 edition = "2024"
 license = "MIT"
 default-run = "openworkers-runner"

Cargo.toml

@@ -462,14 +462,11 @@ async fn handle_worker_request(
 
     let start = tokio::time::Instant::now();
 
-    let is_chunked = headers
-        .get("transfer-encoding")
-        .and_then(|v| v.to_str().ok())
-        .is_some_and(|v| v.eq_ignore_ascii_case("chunked"));
+    let is_streaming = headers.contains_key("x-request-body-stream");
 
     let mut pump_handle: Option<tokio::task::JoinHandle<()>> = None;
 
-    let mut request = if is_chunked {
+    let mut request = if is_streaming {
         // Streaming path: pipe body chunks to the worker via mpsc channel.
         // Guards: 30s idle timeout per chunk, 10MB max total body size.
         const CHUNK_TIMEOUT: std::time::Duration = std::time::Duration::from_secs(5);