[英]Configuring middleware in gulp using gulp-connect plugin
My project's back-end part runs on http://localhost:8080
and front-end is running on gulp-connect server on http://localhost:8811
.While running on chrome, whenever a REST api call is made, chrome generates this error message- 我项目的后端部分运行在
http://localhost:8080
而前端运行在http://localhost:8811
上的gulp-connect服务器上。当在chrome上运行时,每当进行REST api调用时,chrome就会生成此错误消息-
No 'Access-Control-Allow-Origin' header is present on the requested resource 请求的资源上不存在“ Access-Control-Allow-Origin”标头
Can this error be removed using proxy
configuration in gulp-connect's middleware options ? 可以使用gulp-connect的中间件选项中的
proxy
配置来消除此错误吗? if yes then I want to know how. 如果是,那么我想知道如何。 I tried setting a response header 'allow-origin' to ' http://localhost:8811 ' from back-end and it worked but i want to know if gulp can help remove that error.
我尝试将后端的响应标头'allow-origin'设置为' http:// localhost:8811 ',它可以工作,但是我想知道gulp是否可以帮助消除该错误。
Following is snippet from my gulpfile.js
以下是我的
gulpfile.js
代码段
gulp.task('webserver',function(){
gulpWebServer.server({
root : ['.'],
port : 8811,
host : 'gulp_dev',
livereload : true,
middleware: function(connect, opt) {
return [
proxy({ changeOrigin: true,target: 'http://localhost:8080'})
];
}
});
});
and service
is as follows : service
如下:
angular.module('RestAssignment').service('EmployeeService',["$resource",function($resource){
return $resource('',{},{
fetchEmployeeById :{
url:'http://localhost:8080/rest/abc/getEmployeeById/2',
method:'GET'
},
fetchEmployeeList : {
url:'http://localhost:8080/rest/abc/getAllEmployees',
method:'GET',
isArray : true
}
},{});
}]);
FIXED: No 'Access-Control-Allow-Origin' header is present on the requested resource 固定:请求的资源上不存在“ Access-Control-Allow-Origin”标头
install cors package: 安装cors软件包:
npm install --save-dev cors
then add it as middleware to connect: 然后将其添加为中间件以进行连接:
var gulp = require('gulp');
var connect = require('gulp-connect');
var cors = require('cors');
gulp.task('connect', function() {
connect.server({
root: 'app',
middleware: function() {
return [cors()];
}
});
});
The problem was that I was specifying complete URL (even with protocol and port) in $resource
in EmployeeService
which i think was nullifying the effect of proxy and second part of the problem was that i have not specified any path in proxy(
path
, options)
function and because of this all requests were getting proxied but I wanted only REST calls to be proxied as i was getting 'No Access-Control-Allow-Origin header' while making REST API calls. 问题是我在
EmployeeService
$resource
中指定了完整的URL(甚至带有协议和端口),我认为这使代理的作用无效,问题的第二部分是我没有在proxy(
path
, options)
指定任何路径options)
功能,因此,所有请求都被代理,但是我只希望代理REST调用,因为在进行REST API调用时,我收到“ No Access-Control-Allow-Origin标头” 。 so I changed gulpfile.js to the following : 所以我将gulpfile.js更改为以下内容:
gulp.task('webserver',function(){
gulpWebServer.server({
root : ['.'],
port : 8811,
host : 'gulp_dev',
livereload : true,
middleware: function(connect, opt) {
return [
return proxy('/rest/**', { target: 'http://localhost:8080', changeOrigin : true});
];
}
});
});
and EmoloyeeService
to : 和
EmoloyeeService
到:
angular.module('LNAssignment').service('EmployeeService',["$resource",function($resource){
return $resource('',{},{
fetchEmployeeById :{
url:'/rest/abc/getEmployeeById/2',
method:'GET'
},
fetchEmployeeList : {
url:'/rest/abc/getAllEmployees',
method:'GET',
isArray : true
}
},{});
}]);
Now the middleware proxy works perfectly without any CORS related error message. 现在,中间件代理可以完美运行,而没有任何与CORS相关的错误消息。
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