title: How to return Observable not specifing type?
body: <p>I do HTTP request to server using Observer:</p>
  
  <pre><code>public getNewStudyYearForm(schoolId: number, studyPeriodId: number): Observable&lt;Current&gt; {}
  </code></pre>
  
  <p>How to return Observable response not specifing type <code>&lt;Current&gt;</code>? Because I dont want to create model <code>Current</code>;</p>
  
  <p>Is it: <code>Observable&lt;any&gt;</code>?</p>