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Send preload links via HTTP Link headers in addition to LINK tags #1323

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Merged
westonruter merged 10 commits into from
Jul 8, 2024
Merged

Send preload links via HTTP Link headers in addition to LINK tags #1323

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7fdc181
Add support for sending preload links via HTTP headers
AhmarZaidi Jun 28, 2024
1e3a242
PR Changes
AhmarZaidi Jul 2, 2024
e7103c6
Merge branch 'trunk' into preload-links
AhmarZaidi Jul 2, 2024
b36959a
Prepare links
AhmarZaidi Jul 3, 2024
c3acee8
PR Changes
AhmarZaidi Jul 4, 2024
9a47aae
Add test for http link response headers
AhmarZaidi Jul 7, 2024
f2fbe38
Remove unnecessary global namespace backslash
westonruter Jul 8, 2024
d1cd8d4
Escape quoted strings according to RFC 9110
westonruter Jul 8, 2024
25299f7
Merge branch 'trunk' into preload-links
westonruter Jul 8, 2024
f4ab19a
Use array_map() instead of reference
westonruter Jul 8, 2024
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31 changes: 31 additions & 0 deletions plugins/optimization-detective/class-od-preload-link-collection.php
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Original file line number Diff line number Diff line change
Expand Up @@ -166,6 +166,37 @@ public function get_html(): string {
return implode( '', $link_tags );
}

/**
* Gets the HTTP Link header string.
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*
* @return string HTTP Link header.
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*/
public function get_headers(): string {
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$link_headers = array();

foreach ( $this->get_adjacent_deduplicated_links() as $link ) {
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$media_features = array( 'screen' );
if ( null !== $link['minimum_viewport_width'] && $link['minimum_viewport_width'] > 0 ) {
$media_features[] = sprintf( '(min-width: %dpx)', $link['minimum_viewport_width'] );
}
if ( null !== $link['maximum_viewport_width'] && PHP_INT_MAX !== $link['maximum_viewport_width'] ) {
$media_features[] = sprintf( '(max-width: %dpx)', $link['maximum_viewport_width'] );
}
$link['attributes']['media'] = implode( ' and ', $media_features );

$link_header = '<' . esc_url( $link['attributes']['href'] ?? '' ) . '>; rel="preload"';
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foreach ( $link['attributes'] as $name => $value ) {
if ( 'href' !== $name ) {
$link_header .= sprintf( '; %s="%s"', $name, esc_attr( $value ) );
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}
}

$link_headers[] = $link_header;
}

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return 'Link: ' . implode( ', ', $link_headers );
}

/**
* Counts the links.
*
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5 changes: 5 additions & 0 deletions plugins/optimization-detective/optimization.php
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Expand Up @@ -164,6 +164,11 @@ function od_optimize_template_output_buffer( string $buffer ): string {

$tag_visitor_registry = new OD_Tag_Visitor_Registry();

// Send any preload links as Link headers.
if ( count( $preload_links ) > 0 && ! headers_sent() ) {
header( $preload_links->get_headers() );
}

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/**
* Fires to register tag visitors before walking over the document to perform optimizations.
*
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