http-core constants typescript/javascript version (from apache http-components:httpcore)
npm install http-core-constants   
Provide http-constants: (standard)headers and status code from java version org.apache.httpcomponents:httpcore
``typescript
import { HttpHeaders, HttpStatus, HttpRequestMethod } from 'http-core-constants';
console.log(HttpHeaders.ACCEPT); // output: Accept
console.log(HttpStatus.SC_OK); // output: 200 (constants with SC prefix same as apache core constants)``
console.log(HttpStatus.OK); // output: 200
console.log(HttpRequestMethod.GET); // output: GET