Azure Functions, http request gets second last value back - node.js

Question

I'm creating an Node.js API with TypeScript which I want to host in Azure Functions. It sends requests to another public API. I got it to work but it has a bug which I can't resolve.
I'm sending an http post request to my API with Postman. In the body of the request there is a JSON object with one property "id".
But I don't get the last value back as a response. I get the second last value as a response. Assume the first request with id "1" gets "good" as a response. The second request with the id "2" gets a "good" as a response, too. But it should get "bad" as a response. The third request with the id "3" gets as a "bad" as response but it should get "good". The fourth request with the id "4" gets "good" as a response but it should get "bad".
The problem just exsits in my API. When I send requests directly to the another API via Postman, I don't get this problem.
index.js
module.exports = function (context, req) {
if (req.body.checkID) {
api.validationStatus(req.body.checkID)
.then(function (resp) {
if (resp.validated) { // Number is correct
context.log('Result: good');
res = { body: "Result: good" }
}
else if (resp.name === "StatusCodeError") { // Number is not correct
context.log('Result: bad ' + resp.name);
res = { body: "Result: bad " + resp.name }
}
else if (resp.name === "RequestError") { // API is not reachable
context.log('Result, bad ' + resp.name);
res = { body: "Result, bad " + resp.name }
}
else { // Something else went wrong
context.log("Result, bad.");
res = { body: "Result: bad." }
}
});
}
else {
res = {
status: 400,
body: "Please pass an id"
};
}
context.done(null, res);};
api.js
myApi.prototype.validationStatus = function (id) {
// Request options
var options = {
method: 'get',
url: this.config.validationStatusLocationUrl.replace("{id}", id),
headers: { "Authorization": this.config.apiKey }
};
// Request with a promise
return reqpromise(options)
.then(function (res) {
return JSON.parse(res);
})
.catch(function (err) {
return err;
});
};

Answer 1

I got it. The solution is simple and I assume I know why it had this behavior.
The context.done(); needs to be executed in the .then-Section of the promise (in the if and the else section). The problem was that I was sending a response even when the current api request (api.validationStatus()) was not finished yet (async, round robin style) and so I got just the old value of the previous requests.
index.js
module.exports = function (context, req) {
if (req.body.checkID) {
api.validationStatus(req.body.checkID)
.then(function (resp) {
if (resp.validated) { // Number is correct
context.log('Result, good.');
context.res = { body: "Result, good." }
}
else if (resp.name === "StatusCodeError") { // Number is not correct
context.log('Result, bad: ' + resp.name);
context.res = { body: "Result, bad." + resp.name }
context.done();
}
else if (resp.name === "RequestError") { // API is not reachable
context.log('Result, bad: ' + resp.name);
context.res = { body: "Result, bad." + resp.name }
context.done();
}
else { // Something else went wrong
context.log("Result, bad.");
context.res = { body: "Result, bad." }
context.done();
}
context.done();
});
}
else {
context.res = {
status: 400,
body: "Please pass an id"
};
context.done();
}
};