diff --git a/.github/workflows/cd.yml b/.github/workflows/cd.yml
index 805582199bfb3..f007fd64efc99 100644
--- a/.github/workflows/cd.yml
+++ b/.github/workflows/cd.yml
@@ -281,9 +281,6 @@ jobs:
       matrix:
         include:
           # linux
-          - os: ubuntu-latest
-            python: '3.7'
-            python-manylinux-tag: "cp37-cp37m"
           - os: ubuntu-latest
             python: '3.8'
             python-manylinux-tag: "cp38-cp38"
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index be1a07813463d..f694296bfa68a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -42,7 +42,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: Set up Python 3.8
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v2
         with:
           python-version: 3.8
       - id: file_changes
@@ -584,9 +584,6 @@ jobs:
       matrix:
         include:
           # linux
-          - os: ubuntu-latest
-            python: '3.7'
-            python-manylinux-tag: "cp37-cp37m"
           - os: ubuntu-latest
             python: '3.8'
             python-manylinux-tag: "cp38-cp38"
diff --git a/jina/serve/runtimes/gateway/http_fastapi_app_docarrayv2.py b/jina/serve/runtimes/gateway/http_fastapi_app_docarrayv2.py
index 76e3c429da7b9..9939ced58acf0 100644
--- a/jina/serve/runtimes/gateway/http_fastapi_app_docarrayv2.py
+++ b/jina/serve/runtimes/gateway/http_fastapi_app_docarrayv2.py
@@ -41,7 +41,7 @@ def get_fastapi_app(
     if expose_graphql_endpoint:
         logger.error(f' GraphQL endpoint is not enabled when using docarray >0.30')
     with ImportExtensions(required=True):
-        from fastapi import FastAPI, Response, HTTPException
+        from fastapi import FastAPI, Response, HTTPException, status as http_status
         from fastapi.middleware.cors import CORSMiddleware
         import pydantic
         from pydantic import Field
@@ -216,7 +216,7 @@ async def post(body: input_model, response: Response):
                     status = resp.header.status
 
                     if status.code == jina_pb2.StatusProto.ERROR:
-                        raise HTTPException(status_code=499, detail=status.description)
+                        raise HTTPException(status_code=http_status.HTTP_500_INTERNAL_SERVER_ERROR, detail=status.description)
                     else:
                         result_dict = resp.to_dict()
                         return result_dict
diff --git a/jina/serve/runtimes/worker/http_csp_app.py b/jina/serve/runtimes/worker/http_csp_app.py
index a670a0d1d932c..442241f416f07 100644
--- a/jina/serve/runtimes/worker/http_csp_app.py
+++ b/jina/serve/runtimes/worker/http_csp_app.py
@@ -30,7 +30,7 @@ def get_fastapi_app(
     """
     with ImportExtensions(required=True):
         import pydantic
-        from fastapi import FastAPI, HTTPException, Request
+        from fastapi import FastAPI, HTTPException, Request, status as http_status
         from fastapi.middleware.cors import CORSMiddleware
         from pydantic import BaseModel, Field
         from pydantic.config import BaseConfig, inherit_config
@@ -131,7 +131,7 @@ async def process(body) -> output_model:
             status = resp.header.status
 
             if status.code == jina_pb2.StatusProto.ERROR:
-                raise HTTPException(status_code=499, detail=status.description)
+                raise HTTPException(status_code=http_status.HTTP_500_INTERNAL_SERVER_ERROR, detail=status.description)
             else:
                 return output_model(data=resp.docs, parameters=resp.parameters)
 
diff --git a/jina/serve/runtimes/worker/http_fastapi_app.py b/jina/serve/runtimes/worker/http_fastapi_app.py
index 889166d8aeb63..edb4c9dba7afa 100644
--- a/jina/serve/runtimes/worker/http_fastapi_app.py
+++ b/jina/serve/runtimes/worker/http_fastapi_app.py
@@ -33,7 +33,7 @@ def get_fastapi_app(
     :return: fastapi app
     """
     with ImportExtensions(required=True):
-        from fastapi import FastAPI, Response, HTTPException
+        from fastapi import FastAPI, Response, HTTPException, status as http_status
         import pydantic
         from fastapi.middleware.cors import CORSMiddleware
     import os
@@ -116,7 +116,7 @@ async def post(body: input_model, response: Response):
             status = resp.header.status
 
             if status.code == jina_pb2.StatusProto.ERROR:
-                raise HTTPException(status_code=499, detail=status.description)
+                raise HTTPException(status_code=http_status.HTTP_500_INTERNAL_SERVER_ERROR, detail=status.description)
             else:
                 if not docarray_v2:
                     docs_response = resp.docs.to_dict()
diff --git a/jina/serve/runtimes/worker/request_handling.py b/jina/serve/runtimes/worker/request_handling.py
index 450690d33bcdc..97d90fa954372 100644
--- a/jina/serve/runtimes/worker/request_handling.py
+++ b/jina/serve/runtimes/worker/request_handling.py
@@ -1079,7 +1079,6 @@ def _extract_tracing_context(
     ) -> Optional['Context']:
         if self.tracer:
             from opentelemetry.propagate import extract
-
             context = extract(dict(metadata))
             return context
 
@@ -1116,7 +1115,7 @@ async def process_data(
 
                 if is_generator:
                     result = await self.handle_generator(
-                        requests=requests,tracing_context=tracing_context
+                        requests=requests, tracing_context=tracing_context
                     )
                 else:
                     result = await self.handle(