How to post a string in the body of a post request with Angular 4.3 HttpClient?

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小蘑菇
小蘑菇 2021-01-04 02:24

We\'ve got a .net WebAPI which looks for a filepath string in the body of a post request and returns the corresponding image. I\'m struggling to successfully pass a string t

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  • 2021-01-04 02:35

    You can get the path from query by removing [fromBody] attribute

    public HttpResponseMessage ImagesFromPaths(HttpRequestMessage request, string path)
    

    and in post send path in post request ${apiUrl}/${path}:

    return this.http.post(
      `${apiUrl}/${path}`,
      { headers: new HttpHeaders({
        'Content-Type': 'application/json',
      }), responseType: 'blob',
      })
    
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  • 2021-01-04 02:48

    I just tried another altrnative way by this options and directing posting String path Json to body of post method.

     getImage(path: string) {
                let headers = new Headers({ 'Content-Type': 'application/json' });
                let options = new RequestOptions({ headers: headers });
    
                return new Promise((resolve, reject) => {
                    this.http.post('${apiUrl}',path, options)
                    .map((res) => res.json()).share()
                    .subscribe(res => {
                      resolve(res)
                    }, (err) => {
                      reject(err);
                    });
                });
              }
    

    I would be happy if it works.Thanks

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  • 2021-01-04 02:59

    There is almost everything good with your code. Main issue is Content-Type header. If you want to send string to .NET REST API with [FromBody] annotation and use application/json header value you should add "" to your path param for example "test_value":

    return this.http.post(
      `${apiUrl}`,
        `\"${path}\"` ,
      { headers: new HttpHeaders({
        'Content-Type': 'application/json',
      }), responseType: 'blob',
      })
    

    You can also use x-www-form-urlencoded header value. Then you must pass your param to request body in that way:

    return this.http.post(
      `${apiUrl}`,
        `=${path}` ,
      { headers: new HttpHeaders({
        'Content-Type': 'application/x-www-form-urlencoded',
      }), responseType: 'blob',
      })
    
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