Making an HTTP request with headers in Angular 2

Question

Making an HTTP request with headers in Angular 2

I am currently in the process of developing an application that interacts with the Twitter API. I am facing a challenge when attempting to make an HTTP GET request with specific headers using Angular2.

It is worth noting that the curl requests below are successful, provided the correct keys are in place.

The implementation I have tried so far does not allow me to include the necessary headers, which has been my only setback.

If anyone has encountered this issue before and has any recommendations on how to overcome it, I would greatly appreciate your input.

Thank you in advance!

constructor(private _http: Http) {

}

getTwitterResponse() {
         return this._http.get('https://api.twitter.com/1.1/statuses/home_timeline.json')
            .map(res => res.text);
}

Curl Request Sample with Headers (with authentication keys removed)

 curl --get 'https://api.twitter.com/1.1/statuses/home_timeline.json' --header 'Authorization: OAuth oauth_consumer_key="123456", oauth_nonce="123456", oauth_signature="f%123456%3D", oauth_signature_method="HMAC-SHA1", oauth_timestamp="1475158916", oauth_token="123456", oauth_version="1.0"' --verbose

angularjs curl angular typescript ecmascript-6

Answer 1

Answer №1

To include headers in your request, follow this example:

import { Headers, RequestOptions } from '@angular/http';    

getTwitterResponse() {

let headers = new Headers({ "Content-Type": "application/json" });
let options = new RequestOptions({ headers: headers });
let url = 'https://api.twitter.com/1.1/statuses/home_timeline.json';

     return this._http.get(url, options).map(res => res.text);
}

This code explains how to use the get method of Http and its signature:

get(url: string, options?: RequestOptionsArgs)

The second argument, options, is optional and of type RequestOptionsArgs. This interface is used to create RequestOptions, allowing you to pass it as the second argument to get. The attributes of RequestOptionsArgs include:

export interface RequestOptionsArgs {
    url?: string;
    method?: string | RequestMethod;
    search?: string | URLSearchParams;
    headers?: Headers;
    body?: any;
    withCredentials?: boolean;
    responseType?: ResponseContentType;
}

Since all attributes are optional, we can focus on passing only the headers to our options. You have flexibility to modify the Content-Type header or add multiple headers as needed:

headers: Headers = new Headers({
    'First header': 'First value',
    'Second header': 'Second value',
    'Third header': 'Third value',
    'Fourth header': 'Fourth value'
});

For further exploration, check out these resources:

Answer 2

To include headers in your request, follow this example:

import { Headers, RequestOptions } from '@angular/http';    

getTwitterResponse() {

let headers = new Headers({ "Content-Type": "application/json" });
let options = new RequestOptions({ headers: headers });
let url = 'https://api.twitter.com/1.1/statuses/home_timeline.json';

     return this._http.get(url, options).map(res => res.text);
}

This code explains how to use the get method of Http and its signature:

get(url: string, options?: RequestOptionsArgs)

The second argument, options, is optional and of type RequestOptionsArgs. This interface is used to create RequestOptions, allowing you to pass it as the second argument to get. The attributes of RequestOptionsArgs include:

export interface RequestOptionsArgs {
    url?: string;
    method?: string | RequestMethod;
    search?: string | URLSearchParams;
    headers?: Headers;
    body?: any;
    withCredentials?: boolean;
    responseType?: ResponseContentType;
}

Since all attributes are optional, we can focus on passing only the headers to our options. You have flexibility to modify the Content-Type header or add multiple headers as needed:

headers: Headers = new Headers({
    'First header': 'First value',
    'Second header': 'Second value',
    'Third header': 'Third value',
    'Fourth header': 'Fourth value'
});

For further exploration, check out these resources:

Making an HTTP request with headers in Angular 2

Answer №1

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