Securing a REST API: Authentication, Authorization and Best Practices
A poorly secured REST API exposes your data and users' data. Discover authentication patterns (API keys, JWT, OAuth 2.0) and essential best practices.
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Security, Performance & SEO
Practical tips on the key points we check in every full audit.
INP: The New Core Web Vitals Metric Replacing FID
INP (Interaction to Next Paint) replaced FID (First Input Delay) as a Core Web Vitals metric in March 2024. It measures your page's overall responsiveness to all interactions.
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Clickjacking: How Invisible Iframes Steal Your Users' Clicks
Clickjacking overlays a transparent iframe on a page to trick users who click a legitimate button but trigger a hidden action. Two protections: X-Frame-Options and CSP frame-ancestors.
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FAQ and HowTo Structured Data: Getting Google Rich Results
Schema.org FAQ and HowTo types allow Google to display your Q&As and steps directly in search results, increasing your visibility and click-through rates.
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Web Session Management: Securing Authentication Tokens
Poor session management causes many breaches. Learn the best practices: session ID, expiration, post-login regeneration and protection against session fixation.
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Internal Linking: Structuring Your Links to Boost SEO
Internal linking is the practice of creating links between your own pages. It distributes Page Rank, improves Googlebot crawling and guides your visitors.
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Web Accessibility: Alt Text, ARIA and Contrast — Why It Matters
Accessibility isn't just a legal requirement — it's an SEO quality factor. Alt attributes, WCAG contrast ratios, ARIA: what these technical terms actually mean.
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Critical Rendering Path: Optimizing Your Page's Initial Render
The Critical Rendering Path is the sequence of steps a browser performs to display the first frame on screen. Optimizing it directly reduces your LCP.
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E-E-A-T: How Google Evaluates Your Site's Expertise and Trustworthiness
E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness) is the framework Google uses to evaluate content quality. Essential for SEO on YMYL sites.
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Service Workers: Smart Caching and Offline Mode for Your Site
A Service Worker is a JavaScript script that intercepts requests between the browser and network. It enables offline caching, push notifications and PWAs (Progressive Web Apps).
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Permissions-Policy: Controlling Access to Browser Features
The Permissions-Policy header (formerly Feature-Policy) restricts access to the camera, microphone, geolocation and other browser APIs for your site and its iframes.
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DNS-over-HTTPS and DNS-over-TLS: Encrypting Your DNS Queries
Classic DNS (Domain Name System) queries travel in plain text on port 53. DoH (DNS-over-HTTPS) and DoT (DNS-over-TLS) encrypt these queries to protect privacy.
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Title, Meta Description, Headings: The Foundations of On-Page SEO
Rankings depend as much on your HTML tags as on your content. Title, meta description, Open Graph and heading structure: what TheSiteFuse checks and why it matters.
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WebP and AVIF: Modern Image Formats for a Faster Web
WebP offers 30% better compression than JPEG. AVIF goes even further with 50% savings. Learn the differences, browser compatibility and how to migrate your images.
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SQL Injection: Understanding the Attack and Protecting Your Database
SQL injection (SQLi) inserts malicious SQL commands into a database query. It is one of the oldest and most widespread web application vulnerabilities.
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XSS: Understanding Cross-Site Scripting Attacks and How to Prevent Them
XSS (Cross-Site Scripting) is the injection of malicious JavaScript into a web page. Three variants exist: stored, reflected and DOM-based. Here's how to protect yourself.
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SPF, DKIM, DMARC: Protect Your Emails from Spoofing
Without SPF, DKIM and DMARC, anyone can send emails impersonating you. These three DNS records are your domain's essential shield.
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Preload, Prefetch, Preconnect: Resource Hints to Speed Up Your Site
Resource hints (preload, prefetch, preconnect, dns-prefetch) allow the browser to download critical resources before they are discovered in the HTML source.
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Web Fonts: Optimizing Font Loading for Performance
Web fonts directly impact LCP and CLS. Discover FOUT, FOIT, font-display: swap, preloading and best practices for Google Fonts.
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301 and 302 Redirects: SEO Impact and Use Cases
A 301 (permanent) redirect transfers the SEO Page Rank to the new URL. A 302 (temporary) does not. Choosing the right HTTP code is crucial for your search rankings.
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OWASP Top 10: The 10 Most Critical Web Security Risks
The OWASP (Open Worldwide Application Security Project) Top 10 lists the most frequent web security risks. An essential reference for securing your web applications.
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Core Web Vitals: How Performance Impacts Your SEO
Since 2021, Google has included LCP, INP and CLS as ranking factors. Understanding these metrics is essential to improve your SEO and your visitors’ experience.
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hreflang: Optimizing Multilingual and Geographic SEO
The hreflang attribute tells Google the language and country targeted by each version of your page. Essential for multilingual sites or sites with regional versions.
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CDN: Speed Up Your Site for Visitors Worldwide
A CDN (Content Delivery Network) distributes your static files from servers close to your visitors. Discover how Edge caching works and the available solutions.
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HTTPS and SSL: Why It’s Essential for Your Website
The padlock in your browser protects your visitors. Learn how HTTPS, SSL/TLS, HSTS and security headers form an essential shield for your site.
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WAF: The Application Firewall That Protects Your Website
A WAF (Web Application Firewall) filters malicious HTTP requests before they reach your application. Discover how it works and the available solutions.
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HTTP/3 and QUIC: The Future of Ultra-Fast Web Connections
HTTP/3 replaces TCP with QUIC (UDP+TLS 1.3). Less latency, 0-RTT reconnection, and no head-of-line blocking. Discover how this revolutionary protocol works.
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Certificate Transparency: Public Logs for SSL Certificates
CT (Certificate Transparency) is a public log system that records all issued SSL certificates. Mandatory since 2018, it allows detecting fraudulent certificates.
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Canonical URL: Avoiding the Duplicate Content Penalty
The canonical tag (rel="canonical") tells Google the preferred version of a page. Essential for e-commerce sites, category filters and paginated pages.
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XML Sitemap: Best Practices for Google Indexation
An XML sitemap helps Googlebot discover all your pages. Learn the structure, limits, priority and changefreq attributes, and how to submit your sitemap.
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Rate Limiting: Protecting Your Site Against Brute-Force Attacks
Rate limiting blocks repeated attempts on your login forms and APIs. Discover the algorithms, HTTP codes and Apache/Nginx solutions.
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LCP: Optimizing Largest Contentful Paint for SEO
LCP (Largest Contentful Paint) measures the loading time of the largest visible element. Google has integrated this metric into its ranking algorithm since 2021.
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MFA and 2FA: Two-Factor Authentication Explained
MFA (Multi-Factor Authentication) adds a protection layer beyond the password. Discover TOTP, SMS, passkeys and how to implement 2FA on your site.
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Lazy Loading: Load Images Only When Visible
Lazy loading defers off-screen image loading. Discover the loading="lazy" attribute, the Intersection Observer API, and its impact on Core Web Vitals.
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CORS: Understanding Cross-Origin Resource Sharing
CORS (Cross-Origin Resource Sharing) controls requests between different domains. Understanding Access-Control headers is essential to secure your APIs.
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Brotli vs Gzip: Choosing the Best Compression for Your Website
Brotli compresses better than Gzip on HTML, CSS and JavaScript. Discover the technical differences, real gains and how to enable Brotli on Apache and Nginx.
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CAA DNS Record: Control Who Can Issue Your SSL Certificate
The CAA (Certification Authority Authorization) DNS record restricts which certificate authorities can issue certificates for your domain.
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Open Graph Tags: Optimizing Social Media Sharing
Open Graph tags control how your page appears when shared on Facebook, LinkedIn or X. Learn the essential tags and how to test them.
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HTTP/2: Multiplexing, Header Compression and Server Push
HTTP/2 allows multiple simultaneous requests over a single TCP connection. Learn about multiplexing, HPACK header compression and Server Push to speed up your site.
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IPv6: Why Enable Dual-Stack on Your Server
IPv6 coexists with IPv4 in dual-stack mode. Learn why enabling IPv6 improves your site's accessibility and how to check your DNS configuration.
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SRI: Protecting Your Site Against Compromised CDNs
SRI (Subresource Integrity) verifies the integrity of scripts and CSS loaded from external CDNs. Discover how the integrity attribute protects your visitors.
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TLS 1.3: Why Upgrade Your Website Encryption
TLS 1.3 reduces connection latency and removes dangerous algorithms from TLS 1.2. Learn how to enable TLS 1.3 on Apache and Nginx to secure and speed up your site.
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Schema.org Structured Data: Boost Your Google Visibility
Schema.org structured data allows Google to display rich snippets (stars, FAQ, prices) in results. Learn how to implement them in JSON-LD.
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robots.txt: controlling how Google indexes your site
The robots.txt file tells search engines which pages to crawl. Learn to configure it without making the errors that penalise your search engine rankings.
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Secure Cookies: Secure, HttpOnly and SameSite Explained
The Secure, HttpOnly and SameSite flags protect your cookies against XSS theft and CSRF attacks. Learn how to configure them correctly on Apache and Nginx.
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DNSSEC: sign your DNS records to prevent spoofing attacks
DNSSEC adds a cryptographic signature to DNS responses to guarantee their authenticity. Learn how this technology works and how to enable it with your registrar.
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HTTP security headers: X-Frame-Options, X-Content-Type-Options and the rest
HTTP security headers protect visitors against clickjacking, MIME sniffing and other attacks. Complete guide to configure them on Apache and Nginx.
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SSL certificate: everything you need to know to secure your website
A valid SSL certificate is essential for visitor trust and Google ranking. Learn about certificate types, renewal, and common errors to avoid.
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Content Security Policy (CSP): block XSS attacks on your website
CSP is your best ally against XSS injections. Learn how to define an effective content security policy and test it without breaking your site.
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HSTS: force HTTPS and protect against downgrade attacks
The HTTP Strict-Transport-Security header forces browsers to always use HTTPS. Learn how to enable it and prevent downgrade attacks on your website.
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