因此,我正在使用 swiip 的一个 yeoman 项目,名为 Generator-gulp-Angular - 只需执行“npm search gulp-Angular”,您就会看到它。
开箱即用的客户端从 127.0.0.1:3000 运行,我希望对 127.0.0.1:8080 上的 (python) 服务进行 $http 调用。它使用浏览器同步进行实时重新加载,并使用代理中间件进行从客户端到服务器的代理调用。代理中间件默认处于禁用状态,因此技巧是启用它并成功向服务器发出请求并从服务器接收响应。到目前为止我还没有能够成功启用它:-(
更新:我遵循“给自己一个简单的例子”的座右铭重新创建了 yeoman 项目,以便集中精力解决访问控制问题,并且我让它或多或少开箱即用,而无需修改服务器逻辑为了允许跨源请求。令人高兴的是,它就像说明所描述的那样简单。这是扩展 gulp 中间件以执行代理的代理文件,或者更确切地说,从客户端到服务器的映射:
/*jshint unused:false */
/***************
This file proxy.js allows you to configure a proxy system plugged into BrowserSync
in order to redirect backend requests while still serving and watching
files from the web project
IMPORTANT: The proxy is disabled by default.
If you want to enable it, watch at the configuration options and finally
change the `module.exports` at the end of the file
***************/
'use strict';
var proxyMiddleware = require('http-proxy-middleware');
var options = {
target: 'http://127.0.0.1:8080'
};
var proxy = proxyMiddleware('/quote', options);
module.exports = function(){
return [proxy];
}
从 gulpfile (gulpfile.js) 我们有:
'use strict';
var gulp = require('gulp');
var browserSync = require('browser-sync');
var browserSyncSpa = require('browser-sync-spa');
var util = require('util');
var middleware = require('./proxy');
module.exports = function(options) {
function browserSyncInit(baseDir, browser) {
browser = browser === undefined ? 'default' : browser;
var routes = null;
if(baseDir === options.src || (util.isArray(baseDir) && baseDir.indexOf(options.src) !== -1)) {
routes = {
'/bower_components': 'bower_components'
};
}
var server = {
baseDir: baseDir,
routes: routes
};
//
// Here's the relevant bit
//
server.middleware = middleware();
browserSync.instance = browserSync.init({
startPath: '/',
server: server,
browser: browser
});
}
browserSync.use(browserSyncSpa({
selector: '[ng-app]'// Only needed for angular apps
}));
gulp.task('serve', ['watch'], function () {
browserSyncInit([options.tmp + '/serve', options.src]);
});
..
gulp.task('serve:e2e-dist', ['build'], function () {
browserSyncInit(options.dist, []);
});
};
正如您所看到的,我们正在配置 gulp 以了解在客户端上使用时的“/quote”上下文(http://localhost:3000/quote)将被映射到后端(http://localhost:8080/quote) - 了解更多信息:https://github.com/chimurai/http-proxy-middleware/blob/v0.0.5/README.md
这是我们使用 $http 服务在客户端上进行调用的地方:
function quotePriceGenerator($q, $http) {
var lowPrice = 1.45000, highPrice = 1.47000;
var askPrice, sellPrice;
var service = {};
service.getPrice = function() {
var deferred = $q.defer();
$http({
url: '/quote',
method: 'GET'
})
.then(function(quote) {
var date = new Date();
const quoteZoom = 100000;
const quotePipsWindow = -3;
..
qBox['trading-size-string'] = qBox['trading-size'].toString();
service.qBox = qBox;
return deferred.resolve(service);
});
// Returns a random integer between min (included) and max (included)
// Using Math.round() will give you a non-uniform distribution!
function getRandomIntInclusive(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
return deferred.promise;
};
return service;
..
function randomizeAskSell(low, high){
}
}
quotePriceGenerator.$inject = ['$q', '$http'];
export default quotePriceGenerator;
后端是一个 python 龙卷风 REST API,不需要任何 Access-Control-Allow-Origin 配置。这里是:
from __future__ import division
import tornado.ioloop
import pyrestful.rest
import random
from pyrestful import mediatypes
from pyrestful.rest import get
class Quote(object):
quote_date_time = float
..
sell_price = float
trading_size = int
class QuoteResource(pyrestful.rest.RestHandler):
@get(_path="/quote", _produces=mediatypes.APPLICATION_JSON)
def getQuoteJson(self):
price_min = random.randint(145000,146000)/100000
price_max = random.randint(146000,147000)/100000
..
quote.sell_price = sell_price
quote.trading_size = trading_size
return quote
if __name__ == "__main__":
try:
print("Start the service")
app = pyrestful.rest.RestService([QuoteResource])
app.listen(8080)
tornado.ioloop.IOLoop.instance().start()
except KeyboardInterrupt:
print("\nStop the service")
有关错误请求/响应的一些信息也会有所帮助。
您可以尝试设置changeOrigin
参数为 true。这将修改请求的主机标头以匹配服务器的主机名。
var proxyMiddleware = require('http-proxy-middleware');
var options = {
target: 'http://127.0.0.1:8080',
changeOrigin: true // <-- changeOrigin
};
如果这不起作用;你可以添加Access-Control-Allow-Origin
响应的标头:
var proxyMiddleware = require('http-proxy-middleware');
var options = {
target: 'http://127.0.0.1:8080',
onProxyRes: function (proxyRes, req, res) {
proxyRes.headers['Access-Control-Allow-Origin'] = '*';
}
};
http 代理中间件onProxyRes
v0.5.0 中添加了该选项,因此如果您仍在使用 v0.0.5,请务必更新它
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