diff --git a/src/lib/gen/python/server/templates/service.hbs b/src/lib/gen/python/server/templates/service.hbs
index 5fa2cc0..6da566a 100644
--- a/src/lib/gen/python/server/templates/service.hbs
+++ b/src/lib/gen/python/server/templates/service.hbs
@@ -5,6 +5,13 @@ from typing import Any, Generator, Tuple
 
 class {{to_pascal_case feature}}Service(ABC):
 {{#each ops}}{{#each this}}    {{#if (filterNonconst this.res.meta)}}class {{to_pascal_case this.name}}Headers(BaseModel):
+        @classmethod
+        def get(cls) -> '{{to_pascal_case this.name}}Headers':
+            return {{to_pascal_case ../../feature}}Service.{{to_pascal_case this.name}}Headers(
+                {{#each this.res.meta}}{{fmtName @key}}={{stubImpl this}}
+                {{/each}}
+            )
+
         {{#each (filterNonconst this.res.meta)}}{{to_snake_case this.[0]}}: {{fmtType this.[1]}}
         {{/each}}
         def to_dict(self) -> dict[str, str]:
@@ -15,5 +22,5 @@ class {{to_pascal_case feature}}Service(ABC):
 
     {{#unless ../../autoImpl}}@abstractmethod{{/unless}}
     def {{to_snake_case this.name}}(self{{#if this.req}}, {{#if this.req.path}}{{fmtName this.req.path}}: {{>dtoName val=(fmtClass this.req.path)}}{{else}}{{#if (eq this.req.form "multipart/form-data")}}{{fmtName (add this.name "Req")}}: {{>dtoName val=(fmtClass (add this.name "Req"))}}{{else if (or (eq this.req.type "obj") (eq this.req.type "seq") (eq this.req.type "map"))}}{{fmtName (add this.name "Req")}}: {{fmtName (add this.name "Req")}}.{{>dtoName val=(fmtClass (add this.name "Req"))}}{{else}}request: {{fmtType this.req}}{{/if}}{{/if}}{{/if}}{{#each this.params}}, {{to_snake_case this.name}}: {{#if this.opt}}{{fmtOpt (fmtType this)}}{{else}}{{fmtType this}}{{/if}}{{/each}}) -> {{#if this.res}}{{#if (filterNonconst this.res.meta)}}Tuple[{{/if}}{{#if (eq this.res.carrier "stream")}}Generator[{{fmtType this.res}}, None, None]{{else}}{{#if this.res.path}}{{fmtType this.res (to_pascal_case this.name)}}{{else if (or (eq this.res.type "obj") (eq this.res.type "seq") (eq this.res.type "map"))}}{{>dtoName val=(fmtClass (add this.name "Res"))}}{{else}}{{fmtType this.res}}{{/if}}{{/if}}{{#if this.res.meta}}{{#if (filterNonconst this.res.meta)}}, {{to_pascal_case this.name}}Headers]{{/if}}{{/if}}{{else}}None{{/if}}:
-        {{#if ../../autoImpl}}{{#if this.res}}return {{>stubImpl val=this.res key=this.name}}{{else}}pass{{/if}}{{else}}raise NotImplementedError{{/if}}
+        {{#if ../../autoImpl}}{{#if this.res}}return {{#if (filterNonconst this.res.meta)}}({{/if}}{{>stubImpl val=this.res key=this.name}}{{#if (filterNonconst this.res.meta)}}, {{to_pascal_case ../../feature}}Service.{{to_pascal_case this.name}}Headers.get()){{/if}}{{else}}pass{{/if}}{{else}}raise NotImplementedError{{/if}}
 {{/each}}{{/each}}
diff --git a/test/integration/test.py b/test/integration/test.py
index 93003f5..a6fe77e 100644
--- a/test/integration/test.py
+++ b/test/integration/test.py
@@ -33,11 +33,11 @@ class Spec(BaseModel):
         name="openapi",
         entrypoint="api.yml"
     ),
-    # Spec(
-    #     name="openapi_fastapi",
-    #     entrypoint="api.yml",
-    #     params = ["-l=tag"]
-    # ),
+    Spec(
+        name="openapi_fastapi",
+        entrypoint="api.yml",
+        params = ["-l=tag"]
+    ),
 ]
 
 test_integration_path = pathlib.Path(__file__).parent.resolve()