Let's say you have a page which have a full http response


<!doctype html>
    <title>Example Domain</title>

    <meta charset="utf-8" />
    <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <style type="text/css">
    body {
        background-color: #f0f0f2;
        margin: 0;
        padding: 0;
        font-family: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
    div {
        width: 600px;
        margin: 5em auto;
        padding: 2em;
        background-color: #fdfdff;
        border-radius: 0.5em;
        box-shadow: 2px 3px 7px 2px rgba(0,0,0,0.02);
    a:link, a:visited {
        color: #38488f;
        text-decoration: none;
    @media (max-width: 700px) {
        div {
            margin: 0 auto;
            width: auto;

    <h1>Example Domain</h1>
    <p>This domain is for use in illustrative examples in documents. You may use this
    domain in literature without prior coordination or asking for permission.</p>
    <p><a href="https://www.iana.org/domains/example">More information...</a></p>

What hook can you use to capture this full http response?

  • I'm not sure there is a dedicated hook which returns the entire html document, but you could make one using output buffering - start it on wp hook and return the string on shutdown action for example..
    – Q Studio
    Jan 4, 2021 at 22:18
  • I've been thinking the same by using PHP's ob_*() functions. Thanks. I've been finding the hook and it seems there is really no dedicated one for it. Jan 4, 2021 at 22:27
  • Good discussion here: stackoverflow.com/a/22818089/591486
    – Q Studio
    Jan 4, 2021 at 22:32
  • 1
    Note that that solution means that nothing on the page will be rendered until everything is. This is terrible for performance. Jan 5, 2021 at 1:10


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