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Code Reference Classes BP_Activity_Feed BP_Activity_Feed::http_headers()

BP_Activity_Feed::http_headers()

Sets various HTTP headers related to Content-Type and browser caching.

Description

Most of this class method is derived from WP::send_headers().

Source

File: bp-activity/classes/class-bp-activity-feed.php

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protected function http_headers() {
    // Set up some additional headers if not on a directory page
    // this is done b/c BP uses pseudo-pages.
    if ( ! bp_is_directory() ) {
        global $wp_query;
 
        $wp_query->is_404 = false;
        status_header( 200 );
    }
 
    // Set content-type.
    @header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ), true );
    send_nosniff_header();
 
    // Cache-related variables.
    $last_modified      = mysql2date( 'D, d M Y H:i:s O', bp_activity_get_last_updated(), false );
    $modified_timestamp = strtotime( $last_modified );
    $etag               = md5( $last_modified );
 
    // Set cache-related headers.
    @header( 'Last-Modified: ' . $last_modified );
    @header( 'Pragma: no-cache' );
    @header( 'ETag: ' . '"' . $etag . '"' );
 
    // First commit of BuddyPress! (Easter egg).
    @header( 'Expires: Tue, 25 Mar 2008 17:13:55 GMT');
 
    // Get ETag from supported user agents.
    if ( isset( $_SERVER['HTTP_IF_NONE_MATCH'] ) ) {
        $client_etag = wp_unslash( $_SERVER['HTTP_IF_NONE_MATCH'] );
 
        // Remove quotes from ETag.
        $client_etag = trim( $client_etag, '"' );
 
        // Strip suffixes from ETag if they exist (eg. "-gzip").
        $etag_suffix_pos = strpos( $client_etag, '-' );
        if ( ! empty( $etag_suffix_pos ) ) {
            $client_etag = substr( $client_etag, 0, $etag_suffix_pos );
        }
 
    // No ETag found.
    } else {
        $client_etag = false;
    }
 
    // Get client last modified timestamp from supported user agents.
    $client_last_modified      = empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ? '' : trim( $_SERVER['HTTP_IF_MODIFIED_SINCE'] );
    $client_modified_timestamp = $client_last_modified ? strtotime( $client_last_modified ) : 0;
 
    // Set 304 status if feed hasn't been updated since last fetch.
    if ( ( $client_last_modified && $client_etag ) ?
             ( ( $client_modified_timestamp >= $modified_timestamp ) && ( $client_etag == $etag ) ) :
             ( ( $client_modified_timestamp >= $modified_timestamp ) || ( $client_etag == $etag ) ) ) {
        $status = 304;
    } else {
        $status = false;
    }
 
    // If feed hasn't changed as reported by the user agent, set 304 status header.
    if ( ! empty( $status ) ) {
        status_header( $status );
 
        // Cached response, so stop now!
        if ( $status == 304 ) {
            exit();
        }
    }
}

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Changelog

Changelog
Version Description
BuddyPress 1.9.0 Introduced.

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