Tweak reply processing

utils/lookup.py

@@ -35,7 +35,10 @@ def lookup(url: str) -> ap.BaseActivity:
     except requests.RequestException as err:
         raise RemoteServerUnavailableError(f"failed to GET {url}: {err!r}")
 
-    resp.raise_for_status()
+    try:
+        resp.raise_for_status()
+    except Exception:
+        return ap.fetch_remote_activity(url)
 
     # If the page is HTML, maybe it contains an alternate link pointing to an AP object
     for alternate in mf2py.parse(resp.text).get("alternates", []):

utils/nodeinfo.py

@@ -69,7 +69,7 @@ def get_software_name(server: str) -> str:
 
             return SoftwareName.UNKNOWN.value
         except requests.RequestException:
-            pass
+            return SoftwareName.UNKNOWN.value
 
     if _try_mastodon_api(server):
         return SoftwareName.MASTODON.value