fetch

Trying to get then send a cookie using react and fetch

由 拟墨画扇 提交于 2019-12-21 07:34:07
问题 I've been trying to implement some authentication component in my app for a few hours now, and I still don't understand some of the things that are happening. Basically, I'd like to send a POST request containing some credentials to my API , which sends me a cookie back with a token if the credentials worked. Then, the cookie should be included in the headers of all future requests to my API (which I believed was automatic). server.js (my API is a mockup for now, with JSON files) ... app.post

React Native Fetch Blob - undefined is not an object (evaluating 'RNFetchBlob.DocumentDir')

由 南笙酒味 提交于 2019-12-21 04:48:13
问题 Disclaimer I have looked at the trouble shooting page of the wiki, however I still cannot fix the problem I am having. RN version: react-native-cli: 2.0.1 react-native: 0.43.4 My code: import FileUploader from 'react-native-file-uploader' and <Button onPress={() => RNFetchBlob.fetch('POST', 'http://localhost:8000/upload', { 'Content-Type' : 'application/octet-stream' }, RNFetchBlob.wrap('./tempImageStore/image.jpg')) } title={'Upload File'} /> Error I am getting: What I did to install react

Doing a Timeout Error with Fetch - React Native

由 对着背影说爱祢 提交于 2019-12-21 04:17:07
问题 I have a user login function that is working. But, I want to incorporate a time out error for the fetch. Is there a way to set up a timer for 5 seconds or so that would stop trying to fetch after such a time? Otherwise, I just get a red screen after a while saying network error. _userLogin() { var value = this.refs.form.getValue(); if (value) { // if validation fails, value will be null if (!this.validateEmail(value.email)) { Alert.alert( "Enter a valid email", ) } else { fetch("http://51.64

Proper Way to Make API Fetch 'POST' with Async/Await

由 丶灬走出姿态 提交于 2019-12-21 03:58:26
问题 I'm working on a project that requires me to make requests to an API. What is the proper form for making a POST request with Async/Await? As an example, here is my fetch to get a list of all devices. How would I go about changing this request to POST to create a new device? I understand I would have to add a header with a data body. getDevices = async () => { const location = window.location.hostname; const response = await fetch( `http://${location}:9000/api/sensors/` ); const data = await

How to get headers of the response from fetch

由 限于喜欢 提交于 2019-12-21 03:19:46
问题 I am using fetch on chrome Version 52.0.2743.82 (64-bit). I want to get all the headers in the response. Following snippet only return content-type but if you peek into chrome dev tools it shows many other response headers. How to get other headers from fetch. fetch('https://httpbin.org/get') .then(response => { const headers = response.headers.entries(); let header = headers.next(); while (!header.done){ console.log(headers.value); header = header.next(); } }) I tried polyfilling(manually

GET with query string with Fetch in React Native

由 孤者浪人 提交于 2019-12-21 03:10:54
问题 I am making a request like this: fetch("https://api.parse.com/1/users", { method: "GET", headers: headers, body: body }) How do I pass query string parameters? Do I simply add them to the URL? I couldn't find an example in the docs. 回答1: Your first thought was right: just add them to the URL. Remember you can use template strings (backticks) to simplify putting variables into the query. const data = {foo:1, bar:2}; fetch(`https://api.parse.com/1/users?foo=${encodeURIComponent(data.foo)}&bar=$

How to post multipart/formdata using fetch in react-native?

由 霸气de小男生 提交于 2019-12-21 02:46:25
问题 i want to post Form Data like that. what should i prepare for sending image file data? i have Uri, type, filename, size. then will use fetch for it. Content-type in header is 'multipart/formdata' thanks for helping 回答1: You should have an upload function, which should look like this: upload(url, data) { let options = { headers: { 'Content-Type': 'multipart/form-data' }, method: 'POST' }; options.body = new FormData(); for (let key in data) { options.body.append(key, data[key]); } return fetch

SQL SERVER CURSOR

由 三世轮回 提交于 2019-12-20 20:32:23
一：认识游标 游标(Cursor)它使用户可逐行访问由SQL Server返回的结果集。 使用游标(cursor)的一个主要的原因就是把集合操作转换成单个记录处理方式。 用SQL语言从数据库中检索数据后，结果放在内存的一块区域中，且结果往往是一个含有多个记录的集合。 游标机制允许用户在SQL server内逐行地访问这些记录，按照用户自己的意愿来显示和处理这些记录。 二：游标的基本形式 声明游标：形式1DECLARE cursor_name [INSENSITIVE] [SCROLL] CURSORFOR select_statement[FOR {READ ONLY | UPDATE ][OF column_list]}]形式2DECLARE cursor_name CURSOR[LOCAL | GLOBAL][FORWARD_ONLY | SCROLL][STATIC | KEYSET | DYNAMIC][READ_ONLY | SCROLL_LOCKS | OPTIMISTIC]FOR select_statement[FOR {READ ONLY | UPDATE ][OF column_list]}]INSENSITIVE关键字指明要为检索到的结果集建立一个临时拷贝，以后的数据从这个临时拷贝中获取。如果在后来游标处理的过程中，原有基表中数据发生了改变

fetch出问题了？

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-12-20 10:29:18
出什么问题了？ 请仔细看下图 我们可以很简单的发现，我用的是原生api，然后请求一个http协议的， 为什么报错提示的却是GET https:// why？按理来说，这个报错应该为http:// xxxx 基于上面的问题，我们可以推测，这个fetch和标准的fetch有差异。 然后我们很显然会去思考这个差异是哪里的来的？我们可以做以下猜测 最容易改浏览器fetch api的方式就是window.fetch = xxx…，可能是做了类似操作引起了上面的问题。 浏览器出bug了 有其他东西影响了，原生的fetch api让他表现出差异 然后我们可以先开始验证前两条猜测的正确性 1.我们可以很简单发现第一条显然不成立 如果我们修改了原生fetch api，我们打印fetch的值得时候，就会显示我们修改之后的值。所以问题不是因为修改了fetch api 引起的。 第二条也很好验证，在这里就不验证了。这个可能性比较小 那么我们可以得到肯定有其他什么东西影响了fetch api 怀着疑惑，我们看了一眼html <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit

How to figure out the optimal fetch size for the select query

由 对着背影说爱祢 提交于 2019-12-20 09:59:14
问题 In JDBC the default fetch size is 10, but I guess that's not the best fetch size when I have a million rows. I understand that a fetch size too low reduces performance, but also if the fetch size is too high. How can I find the optimal size? And does this have an impact on the DB side, does it chew up a lot of memory? 回答1: As with (almost) anything, the way to find the optimal size for a particular parameter is to benchmark the workload you're trying to optimize with different values of the
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