Unexpected EventSource requests after updating Angular 4.4 to 5.2 - websocket

Question

I am trying to migrate web application I'm working on to Angular 5.2.
Followed the instructions on https://angular-update-guide.firebaseapp.com/ ,
I've been able to run the application in the development mode using 'ng serve -lr' as usually.
However, after application launches, multiple HTTP requests, which weren't triggering on Angular 4.4 are executing and eventually, webpack-dev-server disconnects.
My package.json on Angular 4.4, before update:
"dependencies": {
"#agm/core": "^1.0.0-beta.1",
"#angular/animations": "^4.4.0-RC.0",
"#angular/cdk": "^2.0.0-beta.10",
"#angular/common": "^4.4.4",
"#angular/compiler": "^4.4.4",
"#angular/core": "^4.4.4",
"#angular/forms": "^4.4.4",
"#angular/http": "^4.4.4",
"#angular/material": "^2.0.0-beta.10",
"#angular/platform-browser": "^4.4.4",
"#angular/platform-browser-dynamic": "^4.4.4",
"#angular/router": "^4.4.4",
"#ng-bootstrap/ng-bootstrap": "^1.0.0-beta.5",
"#types/jquery": "^3.2.12",
"angular2-multiselect-dropdown": "^1.3.6",
"angular2-text-mask": "^8.0.4",
"autoprefixer": "^7.1.1",
"bootstrap": "^4.0.0-beta.2",
"core-js": "^2.4.1",
"jquery": "^3.2.1",
"lodash": "^4.17.4",
"moment": "^2.19.1",
"ng2-daterangepicker": "^2.0.12",
"rxjs": "^5.1.0",
"tinymce": "^4.6.7",
"zone.js": "^0.8.4"
}, "devDependencies": {
"#angular/cli": "1.4.5",
"#angular/compiler-cli": "^4.4.4",
"#types/jasmine": "2.5.38",
"#types/node": "~6.0.60",
"codelyzer": "~2.0.0",
"concurrently": "^3.4.0",
"htmlhint-ng2": "0.0.13",
"jasmine-core": "~2.5.2",
"jasmine-spec-reporter": "~3.2.0",
"json-server": "^0.10.1",
"karma": "~1.4.1",
"karma-chrome-launcher": "~2.1.1",
"karma-cli": "~1.0.1",
"karma-coverage-istanbul-reporter": "^0.2.0",
"karma-jasmine": "~1.1.0",
"karma-jasmine-html-reporter": "^0.2.2",
"protractor": "~5.1.0",
"sass-lint": "latest",
"scss-lint": "0.0.0",
"scss-lint-html-reporter": "^0.3.2",
"ts-node": "~2.0.0",
"tslint": "~4.5.0",
"typescript": "~2.2.0"
},
"sasslintConfig": "sass-lint.yml"
}
package.json after update to angular 5.2:
"private": true,
"dependencies": {
"#agm/core": "^1.0.0-beta.2",
"#angular/animations": "^5.2.3",
"#angular/cdk": "^5.1.1",
"#angular/common": "^5.2.3",
"#angular/compiler": "^5.2.3",
"#angular/core": "^5.2.3",
"#angular/forms": "^5.2.3",
"#angular/http": "^5.2.3",
"#angular/material": "^5.1.1",
"#angular/platform-browser": "^5.2.3",
"#angular/platform-browser-dynamic": "^5.2.3",
"#angular/platform-server": "^5.2.3",
"#angular/router": "^5.2.3",
"#ng-bootstrap/ng-bootstrap": "^1.0.0",
"#types/jquery": "^3.2.12",
"angular2-multiselect-dropdown": "^1.3.6",
"angular2-text-mask": "^8.0.4",
"autoprefixer": "^7.2.5",
"bootstrap": "^4.0.0",
"core-js": "^2.5.3",
"file-loader": "^1.1.6",
"jquery": "^3.2.1",
"lodash": "^4.17.5",
"mixpanel-browser": "^2.17.0",
"moment": "^2.19.1",
"ng2-daterangepicker": "^2.0.12",
"node-sass": "^4.7.2",
"popper.js": "^1.12.9",
"rxjs": "^5.5.6",
"tinymce": "^4.7.6",
"zone.js": "^0.8.20"
},
"devDependencies": {
"#angular/cli": "^1.6.7",
"#angular/compiler-cli": "^5.2.3",
"#types/jasmine": "2.5.38",
"#types/node": "^6.0.96",
"codelyzer": "^4.1.0",
"concurrently": "^3.5.1",
"htmlhint-ng2": "0.0.13",
"jasmine-core": "~2.5.2",
"jasmine-spec-reporter": "~3.2.0",
"json-server": "^0.10.1",
"karma": "^2.0.0",
"karma-chrome-launcher": "~2.1.1",
"karma-cli": "~1.0.1",
"karma-coverage-istanbul-reporter": "^0.2.0",
"karma-jasmine": "^1.1.1",
"karma-jasmine-html-reporter": "^0.2.2",
"protractor": "~5.1.0",
"sass-lint": "latest",
"scss-lint": "0.0.0",
"scss-lint-html-reporter": "^0.3.2",
"ts-node": "~2.0.0",
"tslint": "^5.9.1",
"typescript": "^2.6.2",
"webpack": "^3.10.0"
},
"sasslintConfig": "sass-lint.yml"
}
Unexpected requests in the network tab of Chrome Dev Tools
Browser console errors
Similar issue posted on angular-cli GitHub page

Answer 1

Seems like the problem was in webpack live reloading. Solved it by adding parameter to launch script, now it is
ng serve --public-host http://localhost:4200/ -lr