🐞 bug report

Affected Package

@angular/common/http

Is this a regression?

Not sure

Description

The get<T> method on an HttpClient will send the following Accept header with a request if you do not override it:

Accept: application/json, text/plain, */*

This suggests that it is OK if the server responds with text/plain (i.e., not JSON).

However, if the server responds with something similar to this (truncated), you will get an error.

Content-Type: text/plain; charset=utf-8

59fb693e0302a519e0974379

Clearly text/plain is not a valid response type, and the default Accept header should be:

Accept: application/json

🔬 Minimal Reproduction

I will add this later if deemed necessary.

🔥 Exception or Error

"error": {
   "name": "SyntaxError",
   "message": "Unexpected token f in JSON at position 2"
  }

🌍 Your Environment

Angular Version:

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/


Angular CLI: 7.3.2
Node: 10.14.1
OS: win32 x64
Angular: 7.2.5
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, platform-server, router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.13.2
@angular-devkit/build-angular     0.13.2
@angular-devkit/build-optimizer   0.13.2
@angular-devkit/build-webpack     0.13.2
@angular-devkit/core              7.3.2
@angular-devkit/schematics        7.3.2
@angular/cdk                      7.3.2
@angular/cli                      7.3.2
@angular/material                 7.3.2
@ngtools/webpack                  7.3.2
@schematics/angular               7.3.2
@schematics/update                0.13.2
rxjs                              6.4.0
typescript                        3.2.4
webpack                           4.29.5