为什么我从 fetch 调用中得到空响应？
我有用 python 编写的 Azure 函数应用程序。应用程序在天蓝色编辑器中运行良好，并且从 python 调用请求也运行良好。但是当我想从客户端 javascript （从我的 React 应用程序）调用它时，我得到空响应，
我以这种方式调用它：
fetch("https://xxxxx.azurewebsites.net/api/testtrigger?", {
mode: 'no-cors',
method: 'GET'
}).then(response => response.text()).then((response) => {
console.log(response)
})
no-cors 在那里，因为我在本地主机上测试它。
函数代码如下所示：
import logging
import azure.functions as func
def main(req: func.HttpRequest) -> func.HttpResponse:
logging.info('Function called')
return func.HttpResponse("Its working")
Azure 显示正在调用该函数，但是我是否有任何原因错过了为什么这不起作用？我收到响应，但它是空的，这里是响应 json：
Response {type: 'opaque', url: '', redirected: false, status: 0, ok: false, …}
body: (...)bodyUsed: falseheaders: Headers[[Prototype]]: Headersappend: ƒ append()delete: ƒ delete()entries: ƒ entries()forEach: ƒ forEach()get: ƒ ()has: ƒ has()keys: ƒ keys()set: ƒ ()values: ƒ values()constructor: ƒ Headers()Symbol(Symbol.iterator): ƒ entries()Symbol(Symbol.toStringTag): "Headers"[[Prototype]]: Objectok: falseredirected: falsestatus: 0statusText: ""type: "opaque"url: ""[[Prototype]]: Response
Python 中的这段代码工作正常：
import requests
x = requests.get('https://xxxxx.azurewebsites.net/api/testtrigger')
print(x.text)
I have Azure function app written in python. App works in azure editor fine and in calling request from python also fine. But when I want to call it from client side javascript (from my react app) I get empty response
I call it in this way:
fetch("https://xxxxx.azurewebsites.net/api/testtrigger?", {
mode: 'no-cors',
method: 'GET'
}).then(response => response.text()).then((response) => {
console.log(response)
})
The no-cors is there because I test it on localhost.
Function code looks like this:
import logging
import azure.functions as func
def main(req: func.HttpRequest) -> func.HttpResponse:
logging.info('Function called')
return func.HttpResponse("Its working")
Azure shows that function is being called, but is there any reason I missed why this should't work? I receive response but its empty, here is response json:
Response {type: 'opaque', url: '', redirected: false, status: 0, ok: false, …}
body: (...)bodyUsed: falseheaders: Headers[[Prototype]]: Headersappend: ƒ append()delete: ƒ delete()entries: ƒ entries()forEach: ƒ forEach()get: ƒ ()has: ƒ has()keys: ƒ keys()set: ƒ ()values: ƒ values()constructor: ƒ Headers()Symbol(Symbol.iterator): ƒ entries()Symbol(Symbol.toStringTag): "Headers"[[Prototype]]: Objectok: falseredirected: falsestatus: 0statusText: ""type: "opaque"url: ""[[Prototype]]: Response
This code in python works fine:
import requests
x = requests.get('https://xxxxx.azurewebsites.net/api/testtrigger')
print(x.text)
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no-cors是对fetch的显式指令，告诉它不要执行任何需要服务器使用 CORS 授予权限的操作。读取响应正文需要许可。
既然你说了
no-cors你会得到一个空的正文而不是服务器响应的数据。no-corsis an explicit directive tofetchto tell it not to do anything that requires the server to use CORS to grant permission.Reading the response body requires permission.
Since you said
no-corsyou get an empty body instead of the data the server responded with.因此，巴西语的答案是 - 我无法从本地主机上的客户端浏览器调用Azure函数，我必须添加到我的软件包
中。
So bassicaly answer for this is - I can't call azure functions from client side browser on local host, I have to add to my package.json:
and fetch in with: