height correction, new defalt

flight_map/network.py

@@ -6,6 +6,18 @@ from urllib.request import Request, urlopen
 USER_AGENT = "FlightMap/0.1 (local non-commercial flight mapping)"
 
 
+def request_bytes(url: str, *, max_bytes: int = 32 * 1024 * 1024) -> bytes:
+    request = Request(url, headers={"User-Agent": USER_AGENT})
+    try:
+        with urlopen(request, timeout=60) as response:
+            content = response.read(max_bytes + 1)
+    except (URLError, TimeoutError) as exc:
+        raise RuntimeError(f"Raster download failed: {exc}") from exc
+    if len(content) > max_bytes:
+        raise RuntimeError("Raster download exceeds the 32 MiB limit.")
+    return content
+
+
 def request_json(
     url: str, *, data: bytes | None = None, headers: dict[str, str] | None = None
 ) -> Any: