title: How to set header in puppeteer just main page request not all request
body: <p>I want to just apply header in just opened page in puppeteer not all inside page headers</p>
  
  <pre><code>  page.setExtraHTTPHeaders({
       'X-Just-Must-Be-Request-In-Main-Request': '1',
    })
  </code></pre>
  
  <p>will apply all pages request headers all css/js/images and etc...</p>
  
  <p>i want to set just main request headers not all of pages requests.</p>