fetch | 易学教程

has been blocked by CORS policy by using axios and fetch in react [duplicate]

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问题 This question already has answers here : Axios having CORS issue (2 answers) Closed 8 months ago . I'm trying to do a post request of a server but keep getting a CORS error using axios and fetch in React. the code: fetch('https://api/entries', { mode: 'no-cors', method: 'post', headers: { "Content-Type":"application/octet-stream", 'Access-Control-Allow-Origin': true }, body: JSON.stringify({ "KEY":"VALUE" }) }) .then((response) => { console.log(response) }) .catch(err => console.log(err)) or

Nativescript image to Base64 then fetch POST

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问题 How can I Base64 an image so it would be suitable to send with nativescript fetch module? 回答1: Here is a basic demo for your case using test server "use strict"; var imageSourceModule = require("image-source"); function navigatingTo(args) { var page = args.object; // using icon.png from the template app from res://icon var imgSrc = imageSourceModule.fromResource("icon"); var imageAsBase64 = imgSrc.toBase64String("PNG"); fetch("https://httpbin.org/post", { method: "POST", headers: { "Content

JPA & Hibernate 注解

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1 、 @Entity(name="EntityName") 必须 ,name 为可选 , 对应数据库中一的个表 2 、 @Table(name="",catalog="",schema="") 可选 , 通常和 @Entity 配合使用 , 只能标注在实体的 class 定义处 , 表示实体对应的数据库表的信息 name: 可选 , 表示表的名称 . 默认地 , 表名和实体名称一致 , 只有在不一致的情况下才需要指定表名 catalog: 可选 , 表示 Catalog 名称 , 默认为 Catalog(""). schema: 可选 , 表示 Schema 名称 , 默认为 Schema(""). 3 、 @id 必须 @id 定义了映射到数据库表的主键的属性 , 一个实体只能有一个属性被映射为主键 . 置于 getXxxx() 前 . 4 、 @GeneratedValue(strategy=GenerationType,generator="") 可选 strategy: 表示主键生成策略 , 有 AUTO,INDENTITY,SEQUENCE 和 TABLE 4 种 , 分别表示让 ORM 框架自动选择, 根据数据库的 Identity 字段生成 , 根据数据库表的 Sequence 字段生成 , 以有根据一个额外的表生成主键 , 默认为AUTO generator:

How to fetch data from two different sql servers?

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问题 I have an inline query, in which I have one table1 in server1 and another table2 in server2. I need to join these two tables, and fetch data. I can do this like connect to one server, get data and connect to next server...fetch data. and join them. But is there any other better way. I have heard about Linked servers. Will that help here ? Thanks in advance !!! 回答1: Yes, set up a linked server on one server to the other. Then you can just do a normal query with a join. It would look something

Using Fetch in react, need username password to access database

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问题 I have done hours of research on this and just can't find the answer I need. Sorry if this has been asked and I have been bad in my research, if so just link the helpful stack overflow page and I'll be on my merry way. Here is the summary of my problem. I am in a CS4 class and we are designing our own webpage and must use our school's server for database storage. We learned php and how to use mySQL and our POST and GET requests for the server would look like this (written in PHP): require(

Fetch API error handling

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问题 I want to display error message from my API, problem is that I can't reach that error if I check for response.ok , it returns Fetch error, not the one from API.. If I don't use if(response.ok)... it returns the error from API but it dispatches the success action. Here is the example, login action: export const signIn = data => dispatch => { dispatch({ type: SIGN_IN }) fetch(API_URL+'/login', { method: 'POST', headers: { 'content-type': 'application/json' }, body: JSON.stringify(data), })

查看远程仓库：git remote

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 查看远程仓库如果想查看你已经配置的远程仓库服务器，可以运行 git remote -v 命令。它会列出你指定的每一个远程服务器的简写。如果你已经克隆了自己的仓库，那么至少应该能看到 origin - 这是 Git 给你克隆的仓库服务器的默认名字. 从远程仓库中抓取与拉取就如刚才所见，从远程仓库中获得数据，可以执行： $ git fetch [remote-name] 这个命令会访问远程仓库，从中拉取所有你还没有的数据。执行完成后，你将会拥有那个远程仓库中所有分支的引用，可以随时合并或查看。如果你使用 clone 命令克隆了一个仓库，命令会自动将其添加为远程仓库并默认以 “origin” 为简写。所以， git fetch origin 会抓取克隆（或上一次抓取）后新推送的所有工作。必须注意 git fetch 命令会将数据拉取到你的本地仓库 - 它并不会自动合并或修改你当前的工作。当准备好时你必须手动将其合并入你的工作。如果你有一个分支设置为跟踪一个远程分支（阅读下一节与 Git 分支了解更多信息），可以使用 git pull 命令来自动的抓取然后合并远程分支到当前分支。这对你来说可能是一个更简单或更舒服的工作流程；默认情况下， git clone 命令会自动设置本地 master

React Native NetInfo always returns offline

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问题 I'm currently trying to implement some functionality in my react native app where I use information stored locally if the device is offline, and perform a fetch if the device is online. I used NetInfo after reading this How to handle network failure in React-Native, when network is off, but unfortunately I ran into an error where NetInfo always returns offline. I found this github issue, which recommended that I change the host in RCTReachability.m from 'htpp://apple.com' to 'apple.com'.

Insert to JPA collection without loading it

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问题 I'm currently using code like this to add a new entry to a set in my entity. player = em.find(Player.class, playerId); player.getAvatarAttributeOwnership().add(new AvatarAttributeOwnership(...)); It works, but every time I want to add one item, the whole set is loaded. Is there a way (with a query maybe) to add the item without loading the rest? In SQL it would be something like INSERT INTO AvatarAttributeOwnership(player, data, ...) VALUES({player}, ...); Currently uniqueness is maintained

react native fetch not calling then or catch

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问题 I am using fetch to make some API calls in react-native, sometimes randomly the fetch does not fire requests to server and my then or except blocks are not called. This happens randomly, I think there might be a race condition or something similar. After failing requests once like this, the requests to same API never get fired till I reload the app. Any ideas how to trace reason behind this. The code I used is below. const host = liveBaseHost; const url = `${host}${route}?observer_id=${user.