1 files changed, 16 insertions, 21 deletions

diff --git a/mastodon/Mastodon.py b/mastodon/Mastodon.py
index f0d9cc5..e7ec143 100644
--- a/mastodon/Mastodon.py
+++ b/mastodon/Mastodon.py
@@ -167,7 +167,6 @@ class Mastodon:
     If anything is unclear, check the official API docs at
     https://github.com/mastodon/documentation/blob/master/content/en/client/intro.md
     """
-    __DEFAULT_BASE_URL = 'https://mastodon.social'
     __DEFAULT_TIMEOUT = 300
     __DEFAULT_STREAM_TIMEOUT = 300
     __DEFAULT_STREAM_RECONNECT_WAIT_SEC = 5
@@ -260,17 +259,17 @@ class Mastodon:
     ###
     @staticmethod
     def create_app(client_name, scopes=__DEFAULT_SCOPES, redirect_uris=None, website=None, to_file=None,
-                   api_base_url=__DEFAULT_BASE_URL, request_timeout=__DEFAULT_TIMEOUT, session=None):
+                   api_base_url=None, request_timeout=__DEFAULT_TIMEOUT, session=None):
         """
         Create a new app with given `client_name` and `scopes` (The basic scopes are "read", "write", "follow" and "push"
-        - more granular scopes are available, please refer to Mastodon documentation for which).
-
+        - more granular scopes are available, please refer to Mastodon documentation for which) on the instance given
+        by `api_base_url`.
+        
         Specify `redirect_uris` if you want users to be redirected to a certain page after authenticating in an OAuth flow.
         You can specify multiple URLs by passing a list. Note that if you wish to use OAuth authentication with redirects,
         the redirect URI must be one of the URLs specified here.
 
         Specify `to_file` to persist your app's info to a file so you can use it in the constructor.
-        Specify `api_base_url` if you want to register an app on an instance different from the flagship one.
         Specify `website` to give a website for your app.
 
         Specify `session` with a requests.Session for it to be used instead of the default. This can be
@@ -282,6 +281,8 @@ class Mastodon:
 
         Returns `client_id` and `client_secret`, both as strings.
         """
+        if api_base_url is None:
+            raise MastodonIllegalArgumentError("API base URL is required.")  
         api_base_url = Mastodon.__protocolize(api_base_url)
 
         request_data = {
@@ -299,12 +300,10 @@ class Mastodon:
             if website is not None:
                 request_data['website'] = website
             if session:
-                ret = session.post(api_base_url + '/api/v1/apps',
-                                   data=request_data, timeout=request_timeout)
+                ret = session.post(api_base_url + '/api/v1/apps', data=request_data, timeout=request_timeout)
                 response = ret.json()
             else:
-                response = requests.post(
-                    api_base_url + '/api/v1/apps', data=request_data, timeout=request_timeout)
+                response = requests.post(api_base_url + '/api/v1/apps', data=request_data, timeout=request_timeout)
                 response = response.json()
         except Exception as e:
             raise MastodonNetworkError("Could not complete request: %s" % e)
@@ -327,11 +326,11 @@ class Mastodon:
                  request_timeout=__DEFAULT_TIMEOUT, mastodon_version=None,
                  version_check_mode="created", session=None, feature_set="mainline", user_agent="mastodonpy"):
         """
-        Create a new API wrapper instance based on the given `client_secret` and `client_id`. If you
-        give a `client_id` and it is not a file, you must also give a secret. If you specify an
-        `access_token` then you don't need to specify a `client_id`. It is allowed to specify
-        neither - in this case, you will be restricted to only using endpoints that do not
-        require authentication. If a file is given as `client_id`, client ID, secret and
+        Create a new API wrapper instance based on the given `client_secret` and `client_id` on the
+        instance given by `api_base_url`. If you give a `client_id` and it is not a file, you must 
+        also give a secret. If you specify an `access_token` then you don't need to specify a `client_id`.
+        It is allowed to specify neither - in this case, you will be restricted to only using endpoints 
+        that do not require authentication. If a file is given as `client_id`, client ID, secret and
         base url are read from that file.
 
         You can also specify an `access_token`, directly or as a file (as written by `log_in()`_). If
@@ -347,10 +346,6 @@ class Mastodon:
         even in "wait" and "pace" mode, requests can still fail due to network or other problems! Also
         note that "pace" and "wait" are NOT thread safe.
 
-        Specify `api_base_url` if you wish to talk to an instance other than the flagship one. When
-        reading from client id or access token files as written by Mastodon.py 1.5.0 or larger,
-        this can be omitted.
-
         By default, a timeout of 300 seconds is used for all requests. If you wish to change this,
         pass the desired timeout (in seconds) as `request_timeout`.
 
@@ -378,9 +373,9 @@ class Mastodon:
 
         If no other `User-Agent` is specified, "mastodonpy" will be used.
         """
-        self.api_base_url = None
-        if api_base_url is not None:
-            self.api_base_url = Mastodon.__protocolize(api_base_url)
+        if api_base_url is None:
+            raise MastodonIllegalArgumentError("API base URL is required.")
+        self.api_base_url = Mastodon.__protocolize(api_base_url)
 
         self.client_id = client_id
         self.client_secret = client_secret