问题描述
考虑以下最小工作烧瓶应用程序:
Consider the following minimal working flask app:
from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello():
return "I am /"
@app.route("/api")
def api():
return "I am /api"
if __name__ == "__main__":
app.run()
这很有效.但是,当我尝试使用从 hello
路由到 api
路由的请求"模块发出 GET 请求时 - 我在尝试访问时从未在浏览器中收到响应http://127.0.0.1:5000/
This happily works. But when I try to make a GET request with the "requests" module from the hello
route to the api
route - I never get a response in the browser when trying to access http://127.0.0.1:5000/
from flask import Flask
import requests
app = Flask(__name__)
@app.route("/")
def hello():
r = requests.get("http://127.0.0.1:5000/api")
return "I am /" # This never happens :(
@app.route("/api")
def api():
return "I am /api"
if __name__ == "__main__":
app.run()
所以我的问题是:为什么会发生这种情况,我该如何解决?
So my questions are: Why does this happen and how can I fix this?
推荐答案
您正在使用 Flask 测试服务器运行 WSGI 应用程序,默认情况下该服务器使用单个线程来处理请求.因此,当您的一个请求线程尝试回调到同一服务器时,它仍然忙于处理该请求.
You are running your WSGI app with the Flask test server, which by default uses a single thread to handle requests. So when your one request thread tries to call back into the same server, it is still busy trying to handle that one request.
您需要启用线程:
if __name__ == "__main__":
app.run(threaded=True)
或者使用更高级的WSGI服务器;请参阅部署选项.
or use a more advanced WSGI server; see Deployment Options.
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