SEO-Bericht: viagogo.es

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Fix all SEO issues found in the audit of viagogo.es.

Prioritize high-severity issues first, then medium. For each fix, make the actual code change — don't just describe what to do.

```json
{
  "domain": "viagogo.es",
  "scores": {
    "overall": 75,
    "performance": 0,
    "seo": 77,
    "accessibility": 73,
    "bestPractices": 80,
    "security": 72
  },
  "findings": [
    {
      "module": "cookies",
      "severity": "medium",
      "title": "1 cookie missing Secure flag",
      "description": "Cookies without Secure flag can be sent over unencrypted HTTP connections",
      "recommendation": "Add the Secure attribute to all cookies to prevent transmission over HTTP"
    },
    {
      "module": "headers",
      "severity": "high",
      "title": "Missing strict-transport-security",
      "description": "HSTS header is missing. The site may be vulnerable to downgrade attacks.",
      "recommendation": "Add Strict-Transport-Security header with max-age of at least 31536000"
    },
    {
      "module": "headers",
      "severity": "medium",
      "title": "Missing content-security-policy",
      "description": "CSP header is missing. The site may be vulnerable to XSS attacks.",
      "recommendation": "Add a Content-Security-Policy header to restrict resource loading"
    },
    {
      "module": "headers",
      "severity": "medium",
      "title": "Missing x-content-type-options",
      "description": "X-Content-Type-Options is missing. MIME-sniffing attacks are possible.",
      "recommendation": "Add X-Content-Type-Options: nosniff header"
    },
    {
      "module": "headers",
      "severity": "medium",
      "title": "Missing x-frame-options",
      "description": "X-Frame-Options is missing. The site may be vulnerable to clickjacking.",
      "recommendation": "Add X-Frame-Options: DENY or SAMEORIGIN header"
    },
    {
      "module": "ssl",
      "severity": "medium",
      "title": "HTTP does not redirect to HTTPS",
      "description": "Port 80 does not redirect to HTTPS",
      "recommendation": "Set up a 301 redirect from HTTP to HTTPS"
    },
    {
      "module": "meta",
      "severity": "medium",
      "title": "Missing og:title",
      "description": "Open Graph title is not set",
      "recommendation": "Add og:title meta tag for social sharing"
    },
    {
      "module": "meta",
      "severity": "medium",
      "title": "Missing charset declaration",
      "description": "No charset meta tag found",
      "recommendation": "Add <meta charset=\"utf-8\"> as first element in <head>"
    },
    {
      "module": "sitemap",
      "severity": "high",
      "title": "Missing sitemap.xml",
      "description": "No sitemap.xml found at the root",
      "recommendation": "Create a sitemap.xml to help search engines discover all pages"
    },
    {
      "module": "technology",
      "severity": "medium",
      "title": "Mixed content detected",
      "description": "71 resources loaded over HTTP on an HTTPS page",
      "recommendation": "Update all resource URLs to use HTTPS"
    },
    {
      "module": "content",
      "severity": "high",
      "title": "No H1 tag found",
      "description": "The page has no H1 heading",
      "recommendation": "Add exactly one H1 tag with the primary keyword"
    },
    {
      "module": "content",
      "severity": "medium",
      "title": "Thin content",
      "description": "Page has only 0 words (recommended: 300+)",
      "recommendation": "Add more meaningful content — aim for at least 300 words on key pages"
    },
    {
      "module": "content",
      "severity": "medium",
      "title": "Very low text-to-HTML ratio",
      "description": "Text/HTML ratio is 0% (recommended: >5%)",
      "recommendation": "Increase meaningful text content relative to HTML markup"
    },
    {
      "module": "content",
      "severity": "medium",
      "title": "No internal links",
      "description": "No internal links found on the page",
      "recommendation": "Add internal links to help search engines discover and understand your site structure"
    },
    {
      "module": "accessibility",
      "severity": "medium",
      "title": "Missing main landmark",
      "description": "No <main> element or role=\"main\" found",
      "recommendation": "Wrap primary content in a <main> element for screen reader navigation"
    },
    {
      "module": "accessibility",
      "severity": "medium",
      "title": "No skip navigation link",
      "description": "No skip-to-content link at the top of the page",
      "recommendation": "Add a visually hidden skip link as the first focusable element"
    },
    {
      "module": "accessibility",
      "severity": "medium",
      "title": "No headings found",
      "description": "Page has no heading elements (H1-H6)",
      "recommendation": "Add headings to structure content for screen readers and SEO"
    },
    {
      "module": "layout-scan",
      "severity": "medium",
      "title": "No landmark elements",
      "description": "No semantic landmarks found (nav, main, header, footer)",
      "recommendation": "Use semantic HTML5 landmarks for better accessibility and SEO"
    },
    {
      "module": "social-checker",
      "severity": "high",
      "title": "Missing og:title",
      "description": "Open Graph title is not set — social shares will use generic text",
      "recommendation": "Add og:title meta tag for compelling social media previews"
    },
    {
      "module": "social-checker",
      "severity": "medium",
      "title": "Missing og:description",
      "description": "Open Graph description is not set",
      "recommendation": "Add og:description for better social sharing previews"
    },
    {
      "module": "social-checker",
      "severity": "medium",
      "title": "Missing Twitter Card",
      "description": "No twitter:card meta tag — Twitter/X will use default preview",
      "recommendation": "Add twitter:card meta tag (e.g., \"summary_large_image\")"
    },
    {
      "module": "uptime-checker",
      "severity": "high",
      "title": "No HTTPS redirect",
      "description": "HTTP requests are not redirected to HTTPS",
      "recommendation": "Configure a 301 redirect from HTTP to HTTPS for all pages"
    },
    {
      "module": "uptime-checker",
      "severity": "medium",
      "title": "Inconsistent www handling",
      "description": "Both www and non-www versions respond with 200 — one should redirect to the other",
      "recommendation": "Choose either www or non-www as canonical and redirect the other with a 301"
    },
    {
      "module": "brand-checker",
      "severity": "medium",
      "title": "Inconsistent brand name",
      "description": "Multiple brand names detected: viagogo, el sitio de compraventa de entradas, viagogo.es, viagogo",
      "recommendation": "Use the same brand name consistently across title, og:site_name, and Organization schema"
    },
    {
      "module": "crawl-budget",
      "severity": "medium",
      "title": "No sitemap.xml found",
      "description": "sitemap.xml returned HTTP 404",
      "recommendation": "Create a sitemap.xml to help search engines discover all pages"
    }
  ]
}
```