Fix: ghes graphql endpoint error

README.md

@@ -400,6 +400,8 @@ github = GitHub(
 )
 ```
 
+The `base_url` option is used to set the base URL of the GitHub API. If you are using GitHub Enterprise Server, you need to include the `/api/v3` path in the base URL.
+
 The `accept_format` and `previews` are used to set the default `Accept` header, you can find more details in [GitHub API docs](https://docs.github.com/en/rest/overview/media-types).
 
 The `http_cache` option enables the http caching feature powered by [Hishel](https://hishel.com/) for HTTPX. GitHub API limits the number of requests that you can make within a specific amount of time. This feature is useful to reduce the number of requests to GitHub API and avoid hitting the rate limit.

githubkit/graphql/__init__.py

@@ -1,3 +1,4 @@
+import re
 from weakref import ref
 from typing import TYPE_CHECKING, Any, Dict, Optional, cast
 
@@ -35,6 +36,18 @@ def build_graphql_request(
             json["variables"] = variables
         return json
 
+    def _get_graphql_endpoint(self) -> str:
+        base_url = self._github.config.base_url
+        path = base_url.path
+        # workaround for GitHub Enterprise baseUrl set with /api/v3 suffix
+        # https://github.com/octokit/graphql.js/pull/186
+        # https://github.com/octokit/graphql.js/blob/dae781b027c19bcd458577cd9ac6ca888b2fdfeb/src/graphql.ts#L67-L72
+        path, n = re.subn(r"/api/v3/?$", "/api/graphql", path, count=1)
+        # if replaced, return the new path
+        if n:
+            return str(base_url.copy_with(path=path))
+        return "/graphql"
+
     def parse_graphql_response(
         self, response: "Response[GraphQLResponse]"
     ) -> Dict[str, Any]:
@@ -57,7 +70,10 @@ def _request(
         json = self.build_graphql_request(query, variables)
 
         return self._github.request(
-            "POST", "/graphql", json=json, response_model=GraphQLResponse
+            "POST",
+            self._get_graphql_endpoint(),
+            json=json,
+            response_model=GraphQLResponse,
         )
 
     def request(
@@ -71,7 +87,10 @@ async def _arequest(
         json = self.build_graphql_request(query, variables)
 
         return await self._github.arequest(
-            "POST", "/graphql", json=json, response_model=GraphQLResponse
+            "POST",
+            self._get_graphql_endpoint(),
+            json=json,
+            response_model=GraphQLResponse,
         )
 
     async def arequest(

tests/test_graphql/test_endpoint.py

@@ -0,0 +1,11 @@
+from githubkit import GitHub
+
+
+def test_github_api_endpoint():
+    g = GitHub(base_url="https://api.github.com")
+    assert g.graphql._get_graphql_endpoint() == "/graphql"
+
+
+def test_ghes_api_endpoint():
+    g = GitHub(base_url="https://example.github.com/api/v3")
+    assert g.graphql._get_graphql_endpoint() == "https://example.github.com/api/graphql"