Handle non-200 HTTP response codes

Closes #1

README.md

@@ -5,8 +5,7 @@ running `curl <url> | bash`
 
 ## Work in Progress
 
-`netrun` is still experimental; don't rely on its working properly. In
-particular, HTTP response codes are ignored (see #1).
+`netrun` is still experimental; don't rely on its working properly.
 
 ## Try it
 

netrun.py

@@ -65,9 +65,28 @@ url = args.url
 pager = shlex.split(args.pager)
 interpreter = shlex.split(args.interpreter)
 
+while True:
     if not args.quiet:
         print(f"Downloading `{url}`...")
-content = requests.get(url).content
+
+    response = requests.get(url, allow_redirects=False)
+
+    if response.status_code == 200:
+        content = response.content
+        break
+
+    else:
+        try:
+            print(f"{response.status_code} {response.reason} (redirect to `{response.headers['location']}`)")
+            if yn("Do you want to follow this redirect?") == 'y':
+                url = response.headers['location']
+            else:
+                print("Not redirecting.")
+                sys.exit(0)
+        except KeyError:
+            print(f"Download failed: {response.status_code} {response.reason}")
+            sys.exit(0)
+
 if not args.quiet:
     print("Download successful.")
     print("=" * os.get_terminal_size().columns)