How can PHP developers ensure that files are sent securely to the browser?

To ensure that files are sent securely to the browser, PHP developers can use HTTPS protocol to encrypt the data being transmitted. This can be achieved by configuring the web server to use SSL/TLS certificates. Additionally, developers can set proper headers to prevent certain types of attacks such as cross-site scripting (XSS) and content sniffing. 

// Set proper headers to ensure secure file transmission
header("Content-Security-Policy: default-src 'none'; script-src 'self'; connect-src 'self'; img-src 'self'; style-src 'self';");
header("X-Content-Type-Options: nosniff");
header("X-Frame-Options: DENY");
header("X-XSS-Protection: 1; mode=block");

// Force HTTPS connection
if($_SERVER["HTTPS"] != "on"){
    header("Location: https://" . $_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"]);
    exit();
}

Keywords

HTTPS SSL/TLS secure headers content security policy encryption

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