Implementing dynamic options parameter with Angular 2's http.get() function

When working with an Angular app utilizing the HttpClient service, I encountered a scenario where the code worked as expected:

this.http.get(myUrl, {responseType: 'json'})

However, I needed to send the responseType as a dynamic parameter, using something like:

this.http.get(myUrl, { responseType: (condition ? 'json' : 'blob') })

or alternatively:

 let options = { responseType: 'json' };
 if (condition)
      options = { responseType: 'blob' };
 this.http.get(myUrl, options)

Unfortunately, TypeScript generated an error stating No overload matches this call

I am seeking guidance on what mistake I might be making and how I can address this issue?

Thank you!

Note: This stackoverflow discussion about Type "json" | undefined not satisfied by "json" in Angular HttpClient

was helpful in guiding me to update my code as follows:

const options: { responseType: "json" } = { responseType: "json" };
const optionsBlob: { responseType: "blob" } = { responseType: "blob" };

this.http.get(myUrl, condition ? options : optionsBlob)

Despite making these adjustments, the compiler still shows the same error mentioned earlier.

Answer №1

When using HttpClient.get(), there are different overloads depending on the response type: <a href="https://angular.io/api/common/http/HttpClient" rel="nofollow noreferrer">https://angular.io/api/common/http/HttpClient</a>. The compiler can get confused if you don't specify the correct overload for the response type. To avoid ambiguity, make sure to call the appropriate overload based on your condition.</p>
<pre class="lang-js"><code>    if (condition) this.http.get(myUrl, { responseType: 'blob' });
    else this.http.get(myUrl, { responseType: 'json' });

Alternatively, you can use HttpClient.request().

    const responseType = condition ? 'json' : 'blob';
    const request = new HttpRequest('GET', myUrl, { responseType });
    this.http.request(request);

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