transferring various items to the backend post endpoint with Angular 4 HTTP services

Greetings! I am currently facing an issue while attempting to send two objects using the HTTP POST method to the backend server

My development environment consists of Angular 4, TypeScript, and ASP.NET MVC 5

Upon sending the two objects, I encounter a 500 internal server error

Interestingly, when I send just a single object, the backend method is successfully called

Below is the code snippet for passing a single object:

clientSidePostCall(Results:any,Details:any):Observable<any>{
   return this._http.post(Global.ENDPOINT +'BackendMethod/',Results)
            .map((response: Response) => <any>response.json())
            .catch((err:any) => { throw err; });
        }

The above code functions properly when sending the Results object to the BackendMethod as a single parameter

However, it fails when attempting to pass multiple objects to BackendMethod that expects two objects.

   clientSidePostCall(Results:any,Details:any):Observable<any>{
       return this._http.post(Global.ENDPOINT +'BackendMethod/',Results,Details)
                .map((response: Response) => <any>response.json())
                .catch((err:any) => { throw err; });
            }

As mentioned earlier, the above code triggers a 500 internal server error

Here is the signature of my backend method:

 [HttpPost]
        public HttpResponseMessage BackendMethod([FromBody] resultsType Results, [FromBody] detailsType Details)

I would greatly appreciate any assistance on resolving this issue

Additionally, I have a question regarding whether we can pass objects in an HTTP GET request in Angular 4 and TypeScript

Answer №1

Ensure in your Angular code that the Results and Details are properties of a larger object. Send this updated object:

const myPostBody = { resultsType: Results, detailsType: Details }

return this._http.post(Global.ENDPOINT +'BackendMethod', myPostBody)
                .map((response: Response) => <any>response.json())
                .catch((err:any) => { throw err; });

Also verify that the API class type Results aligns with the Class Results being passed.

Answer №2

My understanding of asp.net is limited, but it seems that the third parameter of HttpClient.post should not be used for a second post body. It's important to note that a post request cannot have more than one body. If your backend requires an array input, you should try:

this._http.post(url, [Results, Details])

Answer №3

It is necessary to encapsulate child entities within a parent entity when sending an HTTP Post request. Typically, the child entity represents a business-related object. When the receiving service processes the request, it will extract the individual items using the entity names as properties. Of course, this process requires that your entity is serializable.

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