code: def test_path_prefixing_1(serve_instance):
      def check_req(subpath, text=None, status=None):
          r = requests.get(f"http://localhost:8000{subpath}")
          if text is not None:
              assert r.text == text, f"{r.text} != {text}"
          if status is not None:
              assert (
                  r.status_code == status
              ), f"{r.status_code} != {status}"
  
          return r
  
      @serve.deployment
      class D1:
          def __call__(self, *args):
              return "1"
  
      serve.run(D1.bind(), route_prefix="/hello", name="app1")
      check_req("/", status=404)
      check_req("/hello", text="1")
      check_req("/hello/", text="1")
      check_req("/hello/a", text="1")
  
      @serve.deployment
      class D2:
          def __call__(self, *args):
              return "2"
  
      serve.run(D2.bind(), route_prefix="/", name="app2")
      check_req("/hello/", text="1")
      check_req("/hello/a", text="1")
      check_req("/", text="2")
      check_req("/a", text="2")
  
      @serve.deployment(route_prefix="/hello/world")
      class D3:
          def __call__(self, *args):
              return "3"
  
      serve.run(D3.bind(), route_prefix="/hello/world", name="app3")
      check_req("/hello/", text="1")
      check_req("/", text="2")
      check_req("/hello/world/", text="3")
  
      app = FastAPI()
  
      @serve.deployment
      @serve.ingress(app)
      class D4:
          @app.get("/")
          def root(self):
              return 4
  
          @app.get("/{p}")
          def subpath(self, p: str):
              return p
  
      serve.run(
          D4.bind(), route_prefix="/hello/world/again", name="app4"
      )
      check_req("/hello/") == "1"
      check_req("/") == "2"
      check_req("/hello/world/") == "3"
      check_req("/hello/world/again/") == "4"
      check_req("/hello/world/again/hi") == '"hi"'
  
file_path: ray/python/ray/serve/tests/test_http_routes.py
imports: import time
  import pytest
  import requests
  from fastapi import FastAPI, Request
  from starlette.responses import RedirectResponse
  import ray
  from ray import serve
  from ray.serve._private.constants import SERVE_DEFAULT_APP_NAME
label_desc: Use image node_id 6 for calling a global function with example usage: test_path_prefixing_1(serve_instance) and returns: r, str, str, str, int, p