fetch | 易学教程

Fetch API Using Async/Await Return Value Unexpected [duplicate]

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问题 This question already has an answer here : js async/await return promise (1 answer) Closed last year . Here's the function: const getUserIP = async () => { let response = await fetch('https://jsonip.com/'); let json = await response.json(); console.log(json.ip) return json.ip; }; In the console, the IP address is logged as expected. However, when I save the 'IP address' to a variable: const ip = getUserIP(); And then type ip in the console, the value is shown as: Promise { <state>: "fulfilled

NHibernate iStatelessSession returns duplicate parent instances on eager fetch

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问题 I'm trying to get a root entity and eager fetch it's child entities. But because I'm using the IStatelessSession of NHibernate, it returns duplicates of the root entity for each child. Using an ISession, it would be solved with .TransformUsing(new DistinctRootEntityResultTransformer()) But for an IStatelessSession it's not. Basically it's about the code below, where there's just one instance of Parent, holding 3 Childs. var result = session.QueryOver<Parent>() .Fetch(i => i.Childs).Eager();

FormData POST request throws Network error

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问题 I have a react native app that allows users to upload images to the server along with additional data. I'm using NodeJS and ExpressJS as my backend framework. The route for posting images: router.post("/", checkAuth, upload.single("gallery_item_image"), function (req, res, next) { Branch .findById({ _id: req.body.branch_id }) .exec() .then((doc) => { if(!doc) { return res.status(404).json({ message: "Invalid Branch ID", }) } galleryItem = new GalleryItem({ _id: mongoose.Types.ObjectId(),

Getting Text From Fetch Response Object

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问题 I'm using fetch to make API calls and everything works but in this particular instance I'm running into an issue because the API simply returns a string -- not an object. Typically, the API returns an object and I can parse the JSON object and get what I want but in this case, I'm having trouble finding the text I'm getting from the API in the response object. Here's what the response object looks like. I thought I'd find the text inside the body but I can't seem to find it. Where do I look?

Kafka主要参数详解

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一、相关参数配置 ############################ System ############################# #唯一标识在集群中的ID，要求是正数。 broker.id=0 #服务端口，默认9092 port=9092 #监听地址，不设为所有地址 host.name=debugo01 # 处理网络请求的最大线程数 num.network.threads=2 # 处理磁盘I/O的线程数 num.io.threads=8 # 一些后台线程数 background.threads = 4 # 等待IO线程处理的请求队列最大数 queued.max.requests = 500 # socket的发送缓冲区（SO_SNDBUF） socket.send.buffer.bytes=1048576 # socket的接收缓冲区 (SO_RCVBUF) socket.receive.buffer.bytes=1048576 # socket请求的最大字节数。为了防止内存溢出，message.max.bytes必然要小于 socket.request.max.bytes = 104857600 ############################# Topic ############################# # 每个topic的分区个数

How do I determine the status code of a Fetch request?

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问题 I want to fetch an URL and determine what status code it has, especially if it has an HTTP 301 or HTTP 302 status code: fetch('https://httpstat.us/301', { redirect: 'true'}) .then(response => { console.log(response); const headers = response.headers.entries(); for (h of headers) { console.log(h); } }).catch(err => { console.log("in error case") console.log(err); }) This does give me a lot of information, especially it tells me via: response.redirected Which is true. But this only tells me

Read Authorization header from response

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问题 I am working on a side project in which I want to reuse an existing API. The API has an /auth endpoint which handles POST requests and expects the email and password in the request body. If the email and password are verified, then the server returns a response which contains an Authorization header which holds the value for the token which should be sent in all the subsequent requests. I have a problem retrieving this header from the response. It is visible in both Postman and Chrome Dev

In Expo, Requiring module “fetch”, threw an exception: ReferenceError: Can't find variable: self

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问题 I have searched across different possible answers, but didn't find any appropriate addressing this specific error. I have mentioned the exact error string in the question title. This error started appearing when I installed fetch npm module in my ReactNative app. This error appears just at the time app is launched/loaded on my phone during development. Before installing fetch , my app was loading correctly on the phone. In windows CLI there is no such error that assist me to resolve the issue

react ajax : multiple nested fetch Get

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问题 There is a function that first gets all zones in an environment and then when he found these zones for each zone it will do an api call for the borderpoints. All fetches get executed but the problem is that in the then for the first fetch if I try to write out the length of the zones or try to do a .foreach I get 0. I know this is because it runs async and it is not yet loaded on the moment I do the console.log but I tought it should be. That's why we use the .then isn't it? to wait until the

react ajax : multiple nested fetch Get

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