perf(webui): accelerate JSONL session list and thread loading (#5194)

tests/webui/test_http_utils.py

@@ -0,0 +1,38 @@
+"""Tests for shared embedded WebUI HTTP helpers."""
+
+import gzip
+import json
+
+from nanobot.webui.http_utils import http_json_response
+
+
+def test_http_json_response_compresses_large_payload_when_gzip_is_accepted() -> None:
+    payload = {"message": "响应内容" * 2_000}
+
+    response = http_json_response(payload, accept_encoding="br, gzip; q=0.5")
+
+    assert response.headers["Content-Encoding"] == "gzip"
+    assert response.headers["Vary"] == "Accept-Encoding"
+    assert int(response.headers["Content-Length"]) == len(response.body)
+    assert json.loads(gzip.decompress(response.body)) == payload
+
+
+def test_http_json_response_preserves_identity_when_gzip_is_rejected() -> None:
+    payload = {"message": "x" * 8_000}
+
+    response = http_json_response(payload, accept_encoding="gzip;q=0, br")
+
+    assert "Content-Encoding" not in response.headers
+    assert response.headers["Vary"] == "Accept-Encoding"
+    assert int(response.headers["Content-Length"]) == len(response.body)
+    assert json.loads(response.body) == payload
+
+
+def test_http_json_response_does_not_compress_small_payload() -> None:
+    payload = {"ok": True}
+
+    response = http_json_response(payload, accept_encoding="gzip")
+
+    assert "Content-Encoding" not in response.headers
+    assert response.headers["Vary"] == "Accept-Encoding"
+    assert json.loads(response.body) == payload