xenoterracide xenoterracide - 3 months ago 63
TypeScript Question

fetch api not returning the location header

Here are my headers copied from chrome

Version 52.0.2743.82 (64-bit)
(have yet to determine whether this is isolated to chrome)

Request URL:http://localhost:8080/users
Request Method:POST
Status Code:201
Remote Address:[::1]:8080

Response Headers
view parsed
HTTP/1.1 201
Access-Control-Allow-Origin: http://localhost:9000
Vary: Origin
Access-Control-Allow-Credentials: true
X-Application-Context: application:xenoterracide,development
Location: http://localhost:8080/users/17
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Cache-Control: no-cache, no-store, max-age=0, must-revalidate
Pragma: no-cache
Expires: 0
X-Frame-Options: DENY
Content-Length: 0
Date: Thu, 18 Aug 2016 13:51:19 GMT

Request Headers
view parsed
POST /users HTTP/1.1
Host: localhost:8080
Connection: keep-alive
Content-Length: 92
Pragma: no-cache
Cache-Control: no-cache
accept: application/json
Origin: http://localhost:9000
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.82 Safari/537.36
content-type: application/json
DNT: 1
Referer: http://localhost:9000/
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.8


here's how I'm creating the fetch client

import 'isomorphic-fetch';
import { Router, RouterConfiguration } from 'aurelia-router';
import { Logger } from 'aurelia-logging';
import { Container, LogManager, autoinject } from 'aurelia-framework';
import { Route } from './main/Route';
import { HttpClient } from 'aurelia-fetch-client';

@autoinject
export class App {
router: Router;
private log: Logger = LogManager.getLogger( App );

constructor( container: Container ) {
let client: HttpClient = new HttpClient;
client.configure( config => {
config.useStandardConfiguration()
.withBaseUrl( 'http://localhost:8080/' )
.withDefaults( {
credentials: 'include',
headers: {
Accept: 'application/json'
}
} );
} );
container.registerSingleton( HttpClient, () => client );
}


this is my service code

@autoinject
export class RegistrationSvc {
private log: Logger = LogManager.getLogger( RegistrationSvc.name );

constructor( private client: HttpClient ) {
}

register( user: RegisterUser ): Promise<any> {
let basic = user.email + ':' + user.passwordCredentials.password;
let log = this.log;
log.debug( `registering ${ basic }` );

return this.client.fetch( 'users', {
method: 'post',
body: json( user )
} ).then( response => {
let location = response.headers.get( "Location" );
log.debug( `location ${ location }` );
} );


I ran this in chromes's console

response.headers.forEach( v => console.log( v ) );
VM783:1 no-cache
VM783:1 no-cache, no-store, max-age=0, must-revalidate
VM783:1 0
undefined


... where are the rest of my headers? why are they missing?

Answer

By default the only headers you will be able to get to in your JavaScript from a fetch response are:

  • Cache-Control
  • Content-Language
  • Content-Type
  • Expires
  • Last-Modified
  • Pragma

To expose others, send a Access-Control-Expose-Headers header in the response, with the value either being an explicit list of just the headers you want to expose, or * to expose them all.

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