Добавлено более подробное описание ошибки

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "oxidespotify"
-version = "0.1.0"
+version = "0.2.2"
 description = "Client for Spotify API"
 readme = "README.md"
 authors = [{ name = "Miwory", email = "miwory.uwu@gmail.com" }]

src/oxidespotify/api.py

@@ -36,7 +36,9 @@ class SpotifyAPIClient(OxideHTTP):
     async def _process[T: BaseModel](
         self, req: Response | CachedResponse, schema: type[T] | None
     ) -> T | None:
-        if req.status_code == 204:
+        if req.status_code == 204 or (
+            req.status_code == 200 and schema is None
+        ):
             return None
 
         if req.status_code >= 500:
@@ -128,11 +130,27 @@ class SpotifyAPIClient(OxideHTTP):
     async def pause_playback(self) -> NoReturn:
         raise NotImplementedError
 
-    async def skip_to_next(self) -> NoReturn:
-        raise NotImplementedError
+    async def skip_to_next(self, access_token: str, device_id: str) -> None:
+        req = self.post(
+            '/me/player/next',
+            params={'device_id': device_id},
+            headers=self._auth(access_token),
+        )
 
-    async def skip_to_previous(self) -> NoReturn:
-        raise NotImplementedError
+        req = await self._process_request(req)
+        return await self._process(req, None)
+
+    async def skip_to_previous(
+        self, access_token: str, device_id: str
+    ) -> None:
+        req = self.post(
+            '/me/player/previous',
+            params={'device_id': device_id},
+            headers=self._auth(access_token),
+        )
+
+        req = await self._process_request(req)
+        return await self._process(req, None)
 
     async def seek_to_position(self) -> NoReturn:
         raise NotImplementedError

src/oxidespotify/auth.py

@@ -41,14 +41,15 @@ class SpotifyAuthClient(OxideHTTP):
 
         data = await req.json()
         if req.status_code >= 400:
-            raise s.ClientError(req.status_code, data['error']['message'])
+            err = f'{data["error"]}: {data["error_description"]}'
+            raise s.ClientError(req.status_code, err)
 
         return schema.model_validate(data)
 
     async def user_access_token(self, code: str) -> s.UserAccessToken:
         req = await self.post(
             '/token',
-            json={
+            form={
                 'grant_type': 'authorization_code',
                 'code': code,
                 'redirect_uri': self.__redirect_uri,
@@ -60,7 +61,7 @@ class SpotifyAuthClient(OxideHTTP):
     async def refresh_access_token(self, refresh_token: str) -> s.Token:
         req = await self.post(
             '/token',
-            json={
+            form={
                 'grant_type': 'refresh_token',
                 'refresh_token': refresh_token,
                 'client_id': self.__client_id,