feat: improve error handling in HTTP requests and database fixture loading

vendor/spid-cie-oidc-django/spid_cie_oidc/entity/statements.py

@@ -39,7 +39,15 @@ def get_http_url(urls: list, httpc_params: dict = {}) -> list:
         responses = []
         for i in urls:
             res = requests.get(i, **httpc_params) # nosec - B113
-            responses.append(res.content.decode())
+            body = res.content.decode()
+            if res.status_code != 200:
+                raise RuntimeError(
+                    "HTTP GET failed for "
+                    f"{i}: status={res.status_code} "
+                    f"content_type={res.headers.get('Content-Type', '')} "
+                    f"body_preview={body[:256].strip()}"
+                )
+            responses.append(body)
     else:
         responses = asyncio.run(http_get(urls, httpc_params)) # pragma: no cover
     return responses