The Angular 4 HTTP patch method is encountering difficulties when called in code but functions properly when tested using Post

My attempts to make a patch and post call to the server are failing as it never reaches the server. Interestingly, the same request works flawlessly in Postman, so I suspect there might be an issue with my code.

Both my post and patch methods are essentially the same, so I will only showcase the patch method below:

protected patch(url: string, body: any): Observable<any> {
    let options = this.getRequestOptions(body);
    return this.http.patch(this.baseUrl+url, JSON.stringify(body),options);
}
private getRequestOptions(body:any):RequestOptions{
    let cpHeaders = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({ headers: cpHeaders });

    return options;
}

Please note that

this.baseUrl = "http://localhost/blah/api/
and the url parameter is passed as test.

I would greatly appreciate any assistance or insights on resolving this issue. Thank you in advance!

Update

   [HttpPut]
    public virtual IHttpActionResult Patch([FromBody]T entity)
    {
        return Ok(_repository.Patch(entity));
    }

    [HttpPatch]
    public virtual IHttpActionResult WebPatch([FromBody]T entity)
    {
        return this.Patch(entity);
    }

In the comments section below, I have mentioned the presence of a proxy configuration for further context:

 {
  "/api": {
    "target": "http://localhost/QuickQuoteApi",
    "secure": false,
    "pathRewrite": {
      "^/api": ""
    }
  }
}

Answer №1

Although my response is delayed, it may benefit upcoming developers.

I encountered a similar problem where it functioned in Postman but not in Angular.

Because the patch object is an observable, you need to subscribe to it in order to trigger the patch call.

this.patch(url, payload).subscribe(); // Triggers the path object

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