From cd2bc4e84c38dd20ff1ffbdbe3561290806bff11 Mon Sep 17 00:00:00 2001
From: Will Anderson <will@neuralplatform.ai>
Date: Wed, 29 Apr 2026 16:59:59 -0500
Subject: [PATCH] Auto-detect HTML responses in http_serve, serve with
 text/html content type

---
 bin/el/src/main.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/bin/el/src/main.rs b/bin/el/src/main.rs
index b1b5395..e8d31be 100644
--- a/bin/el/src/main.rs
+++ b/bin/el/src/main.rs
@@ -3915,9 +3915,13 @@ fn dispatch_builtin(
                     method, path, _http_status, _req_latency_ms, request_id
                 ));
 
+                // Auto-detect HTML responses and serve with text/html content type.
+                let trimmed = response_body.trim_start();
+                let is_html = trimmed.starts_with("<!DOCTYPE") || trimmed.starts_with("<html") || trimmed.starts_with("<nav") || trimmed.starts_with("<div") || trimmed.starts_with("<main");
+                let response_header = if is_html { content_html } else { content_json };
                 let _ = request.respond(
                     tiny_http::Response::from_string(response_body)
-                        .with_header(content_json)
+                        .with_header(response_header)
                 );
             }
             stack.push(Value::Nil);