cors

cors解决跨域

由 拈花ヽ惹草 提交于 2020-04-06 12:21:01
CORS是一个W3C标准，全称是"跨域资源共享"（Cross-origin resource sharing）。 它允许浏览器向跨源服务器，发出 XMLHttpRequest 请求，从而克服了AJAX只能 同源 使用的限制。 CORS需要浏览器和服务器同时支持。目前，所有浏览器都支持该功能，IE浏览器不能低于IE10。 浏览器端： 目前，所有浏览器都支持该功能（IE10以下不行）。整个CORS通信过程，都是浏览器自动完成，不需要用户参与。 服务端： CORS通信与AJAX没有任何差别，因此你不需要改变以前的业务逻辑。只不过，浏览器会在请求中携带一些头信息，我们需要以此判断是否允许其跨域，然后在响应头中加入一些信息即可。这一般通过过滤器完成即可。 简单请求 只要同时满足以下两大条件，就属于简单请求。： （1) 请求方法是以下三种方法之一： HEAD GET POST （2）HTTP的头信息不超出以下几种字段： Accept Accept-Language Content-Language Last-Event-ID Content-Type：只限于三个值 application/x-www-form-urlencoded 、 multipart/form-data 、 text/plain 当浏览器发现发起的ajax请求是简单请求时，会在请求头中携带一个字段： Origin .

Cross-Origin Request Blocked with React and Express

由 让人想犯罪 __ 提交于 2020-04-06 06:38:32
问题 So I hit this error, when I was trying to send data to the back end using React. From what I learnt I need to allow the communication on the back-end and in the .htaccess file. Here are some of the links I used: No 'Access-Control-Allow-Origin' - Node / Apache Port Issue How does Access-Control-Allow-Origin header work? Both of them have code, but it didn't help. So far my Server-side code is this: app.use(function (req, res, next) { // Website you wish to allow to connect // res.setHeader(

Allow CORS for PUT in Node.js

由 烂漫一生 提交于 2020-04-05 16:00:53
问题 I am trying to make a PUT call to my rest api endpoint, and getting this error: Method PUT is not allowed by Access-Control-Allow-Methods in preflight response. I enabled CORS using this solution: enable-cors, it works for POST . How do I achieve the same for PUT ? Thanks. 回答1: add this: res.header('Access-Control-Allow-Methods', 'PUT, POST, GET, DELETE, OPTIONS'); app.use(function(req, res, next) { res.header("Access-Control-Allow-Origin", "*"); res.header("Access-Control-Allow-Headers",

Allow CORS for PUT in Node.js

由 混江龙づ霸主 提交于 2020-04-05 15:59:46
问题 I am trying to make a PUT call to my rest api endpoint, and getting this error: Method PUT is not allowed by Access-Control-Allow-Methods in preflight response. I enabled CORS using this solution: enable-cors, it works for POST . How do I achieve the same for PUT ? Thanks. 回答1: add this: res.header('Access-Control-Allow-Methods', 'PUT, POST, GET, DELETE, OPTIONS'); app.use(function(req, res, next) { res.header("Access-Control-Allow-Origin", "*"); res.header("Access-Control-Allow-Headers",

Allow CORS for PUT in Node.js

由 一曲冷凌霜 提交于 2020-04-05 15:58:41
问题 I am trying to make a PUT call to my rest api endpoint, and getting this error: Method PUT is not allowed by Access-Control-Allow-Methods in preflight response. I enabled CORS using this solution: enable-cors, it works for POST . How do I achieve the same for PUT ? Thanks. 回答1: add this: res.header('Access-Control-Allow-Methods', 'PUT, POST, GET, DELETE, OPTIONS'); app.use(function(req, res, next) { res.header("Access-Control-Allow-Origin", "*"); res.header("Access-Control-Allow-Headers",

uniapp发送网络请求出错。

由 北城余情 提交于 2020-04-05 15:34:57
安装 pip install django-cors-headers 注册应用 INSTALLED_APPS = ( ... 'corsheaders', ... ) 中间层设置 MIDDLEWARE = [ ... 'corsheaders.middleware.CorsMiddleware', 'django.middleware.common.CommonMiddleware', ... ] 添加白名单 # CORS 设置跨域域名 CORS_ORIGIN_WHITELIST = ( '127.0.0.1:8080', 'localhost:8080', 'www.xxxx.com:8080', 'api.xxxx.com:8000' ) CORS_ALLOW_CREDENTIALS = True # 允许携带cookieALLOWED_HOSTS = ['www.xxxx.com:8080','api.xxxx.com:8000','127.0.0.1']# 前端需要携带cookies访问后端时,需要设置withCredentials: true 设置允许访问的方法( 已测，没用 ) CORS_ALLOW_METHODS = ( 'GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'OPTIONS' ) 设置允许的header：（未测） CORS

Firebase - Request header field x-firebase-gmpid is not allowed by Access-Control-Allow-Headers in preflight response

由 懵懂的女人 提交于 2020-04-02 16:00:16
问题 My product uses firebase rtdb, firestore, storage, auth, and hosting. I didn't make any changes to my CORS configuration. However, today I started getting the following CORS error while trying to upload images to storage, and retrieve them: Access to XMLHttpRequest at 'https://firebasestorage.googleapis.com/v0/b/diary-a77f6.appspot.com/o?name=images%2FJ1gU3KPfo1cTHJXhT3iopBqrvVs1%2F-M1Ah4xCQ46GvEZtwgR1%2FBalboa%20Pier%2C%20California%20-%201600x1200%20-%20ID%2027253.jpg' from origin 'https:/

wrap-cors middleware not working with system.components

由 [亡魂溺海] 提交于 2020-03-25 21:51:22
问题 I have the following system.components middleware config, in which I'm using the ring.middleware wrap-cors, to allow for redirects to an external server: (defn config [] {:http-port (Integer. (or (env :port) 5000)) :middleware [[wrap-defaults api-defaults] wrap-with-logger wrap-gzip ignore-trailing-slash [wrap-reload {:dir "../../src"}] [wrap-trace :header :ui] wrap-params wrap-keyword-params wrap-cookies [wrap-cors :access-control-allow-headers #{"accept" "accept-encoding" "accept-language"

Browser says access-control-allow-origin header not present in clojure ring

由 为君一笑 提交于 2020-03-25 17:53:53
问题 I make a request to a server through the client browser like so https://example.com/bar, but get the error: Access to XMLHttpRequest at 'https://example.com/bar/' from origin 'https://www.example.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. However, when using clj-http.client, I get the following headers: {"Access-Control-Allow-Headers" "Content-Type", "Server" "Aleph/0.4.4", "Via" "1.1 vegur", "Content-Type" "application

Browser says access-control-allow-origin header not present in clojure ring

由 别来无恙 提交于 2020-03-25 17:52:46
问题 I make a request to a server through the client browser like so https://example.com/bar, but get the error: Access to XMLHttpRequest at 'https://example.com/bar/' from origin 'https://www.example.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. However, when using clj-http.client, I get the following headers: {"Access-Control-Allow-Headers" "Content-Type", "Server" "Aleph/0.4.4", "Via" "1.1 vegur", "Content-Type" "application
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