FastAPI 和 Flask 响应问题

Question

我在下面的代码 Flask 调用 FastAPI 端点。 但是当调用 FastAPI 端点并且 FastAPI 端点日志显示INFO:127.0.0.1:56904 - "POST /runquery HTTP/1.1" 422 Unprocessable Entity时，没有生成响应（错误：422）

FASTAPI 端点的输入

查询：来自 table_tab 的 select c2,c2,c4,c5

环境= iAT

Flask 代码

  import requests
  
  app = Flask(__name__)    
  
  @app.route("/", methods=["GET", "POST"])
  def index():
      query_id = ""
      query = ""
      status = ""
      env = ""
      if request.method == "POST":
          query = request.form["query"]
          env = request.form["env"]
          data = {"query": query, "env": env}
          print(data)
          headers = {'Content-Type': 'application/json'}
          **response = requests.post("http://localhost:8000/runquery", json=data,headers=headers)**
          print(response)
          if response.status_code != 200:
              return f'Error: {response.status_code}'
          else:
              print(response.json())
          response_data = response.json()
          query_id = response_data["query_id"]
          status = response_data["status"]
      return render_template("index.html", query_id=query_id, query=query, status=status, env=env)
  
  
  if __name__ == "__main__":
      app.run(debug=True) ```        


**Here is the FastAPI end point code**
      
 ``` @app.post("/runquery")
  async def runquery(query: str, env: str):
      print('.....')
      delay = 60
      parsed_query = sqlparse.parse(query)[0]
      if parsed_query.get_type() == "SELECT":
          pass
      else:
          return JSONResponse(content={"error": "Only SELECT queries are allowed"}, status_code=422)
          # return {"error": "Only SELECT queries are allowed"}
  
      registry_scheduled = ScheduledJobRegistry(queue=que)
      registry_started = StartedJobRegistry(queue=que)
      # registry_completed = FinishedJobRegistry(queue=que)
      # registry_failed = FailedJobRegistry(queue=que)
  
      if len(registry_scheduled.get_job_ids()) >= 2:
          return JSONResponse(content={"Info": "GQs are already in-progress. Try after some time"})
          # return {"Info": "GQs are already in-progress. Try after some time"}
  
      if len(registry_started.get_job_ids()) >= 2:
          return JSONResponse(content={"Info": "GQs are already in-progress.Try after some time"})
          # return {"Info": "GQs are already in-progress.Try after some time"}
  
      # Generate a unique ID for the query
      query_id = str(uuid.uuid4())
      print('query_id..........', query_id)
      directory_path = os.path.join(home_path, query_id)
      print(directory_path)
      if not os.path.exists(directory_path):
          os.makedirs(directory_path)
  
      file_path = os.path.join(directory_path, "query.sql")
      with open(file_path, "w") as f:
          f.write(query)
  
      # job = que.enqueue(exec_query, query, env, sqlfile)
      job = que.enqueue_in(timedelta(seconds=delay), exec_query, query, env, query_id)
      r.set(query_id, job.id)
  
        # Return the query ID to the user
        return JSONResponse(content={"query_id": query_id, "query": query, "stauts": "OK"}, 
        status_code=202) ```

Answer 1

422是Unprocessable Entity，这意味着你发送的请求在正文中有错误的格式参数。 您必须使用 Pydantic class 来验证 json。

以这种方式更改 FastAPI 端点：

from pydantic import BaseModel

class Data(BaseModel):
    query: str
    env: str

@app.post("/runquery")
async def runquery(data: Data):
    ...