The Angular 4 application is unable to proceed with the request due to lack of authorization

Hello, I am encountering an issue specifically when making a post request rather than a get request.

The authorization for this particular request has been denied.

Interestingly, this function works perfectly fine with my WPF APP and even on Postman. Based on this observation, I suspect there might be an error in my typescript call.

postRequest(url: string, body:any): Observable<any> {

    let options = this.generateOptions(body);

    this.includeJsonHeaders(options.headers);

    return this.http.post(this.appConfig.baseRoute + url, options);
}

private generateOptions(body?:any): RequestOptions {
    let headers = new Headers();
    headers.append('Authorization', `${this.sessionService.session.token_type} ${this.sessionService.session.access_token}`);

    let options = new RequestOptions({ headers: headers });

    if (body !== undefined) {
        options.body = body;
    }

    return options;
}

private includeJsonHeaders(headers: Headers): void {
    headers.append('Content-Type','application/json');
}

Could you kindly assist me in identifying where I may have gone wrong with my request?

For your information, I am utilizing Owin alongside Web API.

Answer â„–1

After spending a good 2 hours struggling with this issue, I finally identified the problem. Sharing my solution here in hopes of helping others facing the same challenge.

The root cause was how I was adding the body - it cannot be included under the options. The correct approach is as follows:

post(url: string, body:any): Observable<any> {

    let options = this.getOptions(body);

    this.addJsonToHeaders(options.headers);

    return this.http.post(this.appConfig.baseRoute + url, body, options);
}

private getOptions(body?:any): RequestOptions {
    let headers = new Headers();
    headers.append('Authorization', `${this.sessionService.session.token_type} ${this.sessionService.session.access_token}`);

    let options = new RequestOptions({ headers: headers });

    return options;
}

Answer â„–2

In the POST request, it is recommended to pass the data in the body of the request instead of in the options parameter.

If you need to send an empty post, simply provide an empty string as the body.

let requestBody = '';
return this.http.post(this.appConfig.baseRoute + url, requestBody, options);

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