chunithm.ts: Beat compression m/ware with a wrench

Force unconditional compression of responses harder.

src/chunithm.ts

@@ -8,7 +8,20 @@ const app = express();
 // attempt to inflate whatever response we send to it whether there's a
 // Transfer-Encoding header or not.
 
-app.use(compression());
+app.use(function(req, res, next) {
+  // Chunithm client does not follow the HTTP spec: user agents must indicate
+  // that they are willing to accept a particular Transfer-Encoding for that
+  // T-E to be used (unless the T-E in question is "chunked" but w/e), and this
+  // indication is advisory anyway, the server is permitted to ignore it.
+  //
+  // Force this header into the request, since it is not present normally.
+
+  req.headers["accept-encoding"] = "deflate";
+
+  return next();
+});
+
+app.use(compression({ threshold: 0 }));
 app.use(express.json());
 
 // Trace requests and responses