Python localhost中React的Flask API调用的CORS问题
我正在从React调用一个FlaskAPI(都在本地主机上运行),我遇到了CORS问题。 当发出请求时,浏览器(Chrome)会出现以下错误Python localhost中React的Flask API调用的CORS问题,python,reactjs,flask,cors,axios,Python,Reactjs,Flask,Cors,Axios,我正在从React调用一个FlaskAPI(都在本地主机上运行),我遇到了CORS问题。 当发出请求时,浏览器(Chrome)会出现以下错误 Access to XMLHttpRequest at 'http://localhost:5000/sas' from origin 'http://localhost:3000' has been blocked by CORS policy: Response to preflight request doesn't pass access cont
Access to XMLHttpRequest at 'http://localhost:5000/sas' from origin 'http://localhost:3000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: Redirect is not allowed for a preflight request.
安装程序
烧瓶设置如下所示
from flask_cors import CORS
from flask import Flask, request, Response
from flask_restful import Api, Resource
import json
class SAS(Resource):
def get(self):
content = request.json
js = json.dumps(
{
"Response": "Some response"
}
)
resp = Response(js, status=200, mimetype='application/json')
return resp
app = Flask(__name__)
cors = CORS(app)
api = Api(app)
api.add_resource(SAS, '/sas/')
buttonPressed = async event => {
event.preventDefault();
const response = await axios.get(`http://localhost:5000/sas`, {
data: {
user: "user",
file_name: "user",
directory_name: "user"
}
});
};
在React中使用axios的调用如下
from flask_cors import CORS
from flask import Flask, request, Response
from flask_restful import Api, Resource
import json
class SAS(Resource):
def get(self):
content = request.json
js = json.dumps(
{
"Response": "Some response"
}
)
resp = Response(js, status=200, mimetype='application/json')
return resp
app = Flask(__name__)
cors = CORS(app)
api = Api(app)
api.add_resource(SAS, '/sas/')
buttonPressed = async event => {
event.preventDefault();
const response = await axios.get(`http://localhost:5000/sas`, {
data: {
user: "user",
file_name: "user",
directory_name: "user"
}
});
};
注意:运行来自Postman的请求可以工作并显示标题accesscontrolalloworigin=*
你知道怎么解决这个问题吗
另外,如果我将React前端和API作为停靠应用程序运行,我应该不会再看到这个问题了,对吗?在这种情况下,我也会考虑在我开发 < P>时,请尝试使用这个最小例子中的SigRoOx原创性装饰器:
from flask import Flask, request, jsonify
from flask_cors import CORS, cross_origin
app = Flask(__name__)
CORS(app, support_credentials=True)
@app.route('/sas', methods=['POST', 'GET', 'OPTIONS'])
@cross_origin(supports_credentials=True)
def index():
if(request.method=='POST'):
some_json = request.get_json()
return jsonify({"key": some_json})
else:
return jsonify({"GET": "Nice Get Request"})
if __name__=="__main__":
app.run(host='0.0.0.0', port=5000)
如果这样做有效,那么我们将在代码中实现相同的装饰器。这是否相关?谢谢@Pitto指出这一点。我以前看到过这个页面,但是不幸的是,它没有帮助解决这个问题,但是仍然不起作用。该错误现在与访问位于的XMLHttpRequest的
略有不同http://localhost:5000/sas/“(已从中重定向”http://localhost:5000/sas')源于http://localhost:3000'已被CORS策略阻止:对飞行前请求的响应未通过访问控制检查:它没有HTTP ok状态。
我终于能够使用您的建议从React发送请求,但也修改了React请求以发送到http://127.0.0.1:5000/sas
而不是http://localhost:5000/sas
(为什么会有所不同?)。使用flask\u restful
Hi@GZZ仍不工作。请考虑我的回答和/或选择它作为最终答案,如果它对你有用。谢谢