https://rodrigocastilho.com

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  "markdown": "## My repositories on GitHub\n\n1.  [rodcast.github.io](https://github.com/rodcast/rodcast.github.io \"rodcast.github.io\")💀 Rodrigo Castilho | Personal website built with Next.js 16, TypeScript, GitHub API, Medium API, GitHub Pages, and Vercel #rodrigocastilho\n2.  [chrome-extension-filter-by-videos-shorts-subscriptions-youtube](https://github.com/rodcast/chrome-extension-filter-by-videos-shorts-subscriptions-youtube \"chrome-extension-filter-by-videos-shorts-subscriptions-youtube\")⚙️ This extension helps you to filter your Subscriptions by either Videos or Shorts on Youtube.\n3.  [slickmap](https://github.com/rodcast/slickmap \"slickmap\")🌲 SlickMap is inspired on SlickMap CSS: Create site map with base JSON tree.\n\n[View all repositories →](https://github.com/rodcast \"View all repositories on GitHub\")\n\n## My articles on Medium\n\n1.  [Fetch API — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle](https://medium.com/@rodcast/fetch-api-understanding-javascript-api-requests-and-responses-in-the-data-fetching-lifecycle-96ae79f9a0d4?source=rss-105526889e2f------2 \"Fetch API — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle\")May 15, 2023The Fetch API is a powerful and flexible tool for making HTTP requests in the browser.\n2.  [Async/Await — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle](https://medium.com/@rodcast/async-await-understanding-javascript-api-requests-and-responses-in-the-data-fetching-lifecycle-7e42af034f5?source=rss-105526889e2f------2 \"Async/Await — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle\")May 8, 2023Make your asynchronous code more readable and easier to understand.\n3.  [Promises — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle](https://medium.com/@rodcast/promises-understanding-javascript-api-requests-and-responses-in-the-data-fetching-lifecycle-178f1277cb88?source=rss-105526889e2f------2 \"Promises — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle\")May 1, 2023A powerful feature of JavaScript that makes it easier to write Asynchronous code.\n4.  [Synchronous and Asynchronous — Understanding JavaScript API Requests and Responses in the Data…](https://medium.com/@rodcast/synchronous-and-asynchronous-understanding-javascript-api-requests-and-responses-in-the-data-64fa9e8cd319?source=rss-105526889e2f------2 \"Synchronous and Asynchronous — Understanding JavaScript API Requests and Responses in the Data…\")April 24, 2023Two different types of programming implementations can confuse.\n5.  [AJAX and XMLHttpRequest — Understanding JavaScript API Requests and Responses in the Data Fetching…](https://medium.com/@rodcast/ajax-and-xmlhttprequest-understanding-javascript-api-requests-and-responses-in-the-data-fetching-507a7959330e?source=rss-105526889e2f------2 \"AJAX and XMLHttpRequest — Understanding JavaScript API Requests and Responses in the Data Fetching…\")April 17, 2023You can create web applications that are more responsive and user-friendly by using AJAX and XMLHttpRequest.\n6.  [Callbacks — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle](https://medium.com/@rodcast/callbacks-understanding-javascript-api-requests-and-responses-in-the-data-fetching-lifecycle-499cdeb026ee?source=rss-105526889e2f------2 \"Callbacks — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle\")April 10, 2023A callback is a programming technique in which a function is passed as an argument to another function and is executed.\n7.  [V8 JavaScript engine — Understanding JavaScript API Requests and Responses in the Data Fetching…](https://medium.com/@rodcast/v8-javascript-engine-understanding-javascript-api-requests-and-responses-in-the-data-fetching-311481bdae6a?source=rss-105526889e2f------2 \"V8 JavaScript engine — Understanding JavaScript API Requests and Responses in the Data Fetching…\")April 3, 2023V8 is the most popular JavaScript engine and was developed by Google.\n8.  [Introduction — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle](https://medium.com/@rodcast/introduction-understanding-javascript-api-requests-and-responses-in-the-data-fetching-lifecycle-9eae22fd3d16?source=rss-105526889e2f------2 \"Introduction — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle\")March 27, 2023It’s important to note that using client-side data fetching can affect the performance of your application.\n9.  [Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle](https://medium.com/@rodcast/understanding-javascript-api-requests-and-responses-in-thedata-fetching-lifecycle-539bf96b2293?source=rss-105526889e2f------2 \"Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle\")March 20, 2023In this article series <strong>Introduction, V8 JavaScript engine, Callbacks, AJAX/XMLHttpRequest, Synchronous/Asynchronous, Promises, Async/Await, Fetch API, and Conclusion</strong>.\n10.  [Just Let Me Say — Be Yourself](https://medium.com/@rodcast/just-let-me-say-be-yourself-b2f5cedeb5a1?source=rss-105526889e2f------2 \"Just Let Me Say — Be Yourself\")February 12, 2020I want to say something to you and would like you never forget.\n\n[Read all articles →](https://medium.com/@rodcast \"Read all articles on Medium\")\n",
  "fullPageMarkdown": "Rodrigo Castilho - Staff Frontend Software Engineer\n\n# Rodrigo CastilhoRODCAST\n\nToggle between light and dark theme. Currently in light mode.\n\n![Professional headshot of Rodrigo Castilho, Staff Frontend Software Engineer](https://rodrigocastilho.com/rodrigo-castilho-rodcast_photo.jpg)## Rodrigo Castilho\n\nStaff Frontend Software Engineer at [Wellhub](https://github.com/gympass) specializing in React, Next.js, JavaScript, TypeScript, AWS, design systems, web performance, and SEO.\n\nIn a committed relationship with code and the gym.\n\n-   [GitHub](https://github.com/rodcast \"Follow me on GitHub\")\n-   [Twitter](https://twitter.com/rodcast \"Follow me on Twitter\")\n-   [LinkedIn](https://www.linkedin.com/in/rodcast \"Follow me on LinkedIn\")\n-   [Medium](https://medium.com/@rodcast \"Follow me on Medium\")\n\n## My repositories on GitHub\n\n1.  [rodcast.github.io](https://github.com/rodcast/rodcast.github.io \"rodcast.github.io\")💀 Rodrigo Castilho | Personal website built with Next.js 16, TypeScript, GitHub API, Medium API, GitHub Pages, and Vercel #rodrigocastilho\n2.  [chrome-extension-filter-by-videos-shorts-subscriptions-youtube](https://github.com/rodcast/chrome-extension-filter-by-videos-shorts-subscriptions-youtube \"chrome-extension-filter-by-videos-shorts-subscriptions-youtube\")⚙️ This extension helps you to filter your Subscriptions by either Videos or Shorts on Youtube.\n3.  [slickmap](https://github.com/rodcast/slickmap \"slickmap\")🌲 SlickMap is inspired on SlickMap CSS: Create site map with base JSON tree.\n\n[View all repositories →](https://github.com/rodcast \"View all repositories on GitHub\")\n\n## My articles on Medium\n\n1.  [Fetch API — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle](https://medium.com/@rodcast/fetch-api-understanding-javascript-api-requests-and-responses-in-the-data-fetching-lifecycle-96ae79f9a0d4?source=rss-105526889e2f------2 \"Fetch API — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle\")May 15, 2023The Fetch API is a powerful and flexible tool for making HTTP requests in the browser.\n2.  [Async/Await — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle](https://medium.com/@rodcast/async-await-understanding-javascript-api-requests-and-responses-in-the-data-fetching-lifecycle-7e42af034f5?source=rss-105526889e2f------2 \"Async/Await — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle\")May 8, 2023Make your asynchronous code more readable and easier to understand.\n3.  [Promises — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle](https://medium.com/@rodcast/promises-understanding-javascript-api-requests-and-responses-in-the-data-fetching-lifecycle-178f1277cb88?source=rss-105526889e2f------2 \"Promises — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle\")May 1, 2023A powerful feature of JavaScript that makes it easier to write Asynchronous code.\n4.  [Synchronous and Asynchronous — Understanding JavaScript API Requests and Responses in the Data…](https://medium.com/@rodcast/synchronous-and-asynchronous-understanding-javascript-api-requests-and-responses-in-the-data-64fa9e8cd319?source=rss-105526889e2f------2 \"Synchronous and Asynchronous — Understanding JavaScript API Requests and Responses in the Data…\")April 24, 2023Two different types of programming implementations can confuse.\n5.  [AJAX and XMLHttpRequest — Understanding JavaScript API Requests and Responses in the Data Fetching…](https://medium.com/@rodcast/ajax-and-xmlhttprequest-understanding-javascript-api-requests-and-responses-in-the-data-fetching-507a7959330e?source=rss-105526889e2f------2 \"AJAX and XMLHttpRequest — Understanding JavaScript API Requests and Responses in the Data Fetching…\")April 17, 2023You can create web applications that are more responsive and user-friendly by using AJAX and XMLHttpRequest.\n6.  [Callbacks — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle](https://medium.com/@rodcast/callbacks-understanding-javascript-api-requests-and-responses-in-the-data-fetching-lifecycle-499cdeb026ee?source=rss-105526889e2f------2 \"Callbacks — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle\")April 10, 2023A callback is a programming technique in which a function is passed as an argument to another function and is executed.\n7.  [V8 JavaScript engine — Understanding JavaScript API Requests and Responses in the Data Fetching…](https://medium.com/@rodcast/v8-javascript-engine-understanding-javascript-api-requests-and-responses-in-the-data-fetching-311481bdae6a?source=rss-105526889e2f------2 \"V8 JavaScript engine — Understanding JavaScript API Requests and Responses in the Data Fetching…\")April 3, 2023V8 is the most popular JavaScript engine and was developed by Google.\n8.  [Introduction — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle](https://medium.com/@rodcast/introduction-understanding-javascript-api-requests-and-responses-in-the-data-fetching-lifecycle-9eae22fd3d16?source=rss-105526889e2f------2 \"Introduction — Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle\")March 27, 2023It’s important to note that using client-side data fetching can affect the performance of your application.\n9.  [Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle](https://medium.com/@rodcast/understanding-javascript-api-requests-and-responses-in-thedata-fetching-lifecycle-539bf96b2293?source=rss-105526889e2f------2 \"Understanding JavaScript API Requests and Responses in the Data Fetching lifecycle\")March 20, 2023In this article series <strong>Introduction, V8 JavaScript engine, Callbacks, AJAX/XMLHttpRequest, Synchronous/Asynchronous, Promises, Async/Await, Fetch API, and Conclusion</strong>.\n10.  [Just Let Me Say — Be Yourself](https://medium.com/@rodcast/just-let-me-say-be-yourself-b2f5cedeb5a1?source=rss-105526889e2f------2 \"Just Let Me Say — Be Yourself\")February 12, 2020I want to say something to you and would like you never forget.\n\n[Read all articles →](https://medium.com/@rodcast \"Read all articles on Medium\")\n",
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  "llmsTxtPreview": "# rodrigocastilho.com\n\n> Staff Frontend Software Engineer at Wellhub specializing in React, Next.js, JavaScript, TypeScript, AWS, design systems, web performance, and SEO.\n\n## Main\n- [Rodrigo Castilho - Staff Frontend Software Engineer](https://rodrigocastilho.com): Staff Frontend Software Engineer at Wellhub specializing in React, Next.js, JavaScript, TypeScript, AWS, design systems…\n- [About](https://rodrigocastilho.com/)\n- [RSS Feed](https://rodrigocastilho.com/feed.xml)\n- [Sitemap](https://rodrigocastilho.com/sitemap.xml)\n\n",
  "llmsTxtExisting": "# Rodrigo Castilho\n\n> Staff Frontend Software Engineer at Wellhub specializing in React, Next.js, JavaScript, TypeScript, AWS, design systems, web performance, and SEO. Personal site exposing public profile, projects, and articles as agent-friendly content.\n\nThe site is a statically exported Next.js application. Project and article data are fetched at build time from the GitHub REST API and the Medium RSS feed. The Markdown homepage is available directly at `/index.md`. Accept-based content negotiation on `/` works only on hosts that honor the repository's rewrite and header configuration; GitHub Pages does not.\n\n## Content\n\n- [Homepage (Markdown)](https://rodrigocastilho.com/index.md): Profile summary, projects, and articles with embedded schema.org JSON-LD.\n- [RSS Feed](https://rodrigocastilho.com/feed.xml): Site feed.\n- [Sitemap](https://rodrigocastilho.com/sitemap.xml): List of indexable URLs.\n\n## API\n\n- [OpenAPI Specification](https://rodrigocastilho.com/docs/api/openapi.json): OpenAPI 3.1 description of the public endpoints.\n- [API Documentation](https://rodrigocastilho.com/docs/api/): Human-readable API docs.\n- [API Documentation (Markdown)](https://rodrigocastilho.com/docs/api.md): Agent-friendly API docs.\n- [API Catalog](https://rodrigocastilho.com/.well-known/api-catalog): RFC 9727 linkset advertising API discovery endpoints.\n\n## Agents\n\n- [Agent Card](https://rodrigocastilho.com/.well-known/agent-card.json): Agent metadata for this site.\n- [Agent Skills Index](https://rodrigocastilho.com/.well-known/agent-skills/index.json): Catalog of agent skills (markdown negotiation, API discovery, WebMCP tools, auth).\n- [MCP Server Card](https://rodrigocastilho.com/.well-known/mcp/server-card.json): Model Context Protocol server descriptor.\n\n## Social\n\n- [GitHub](https://github.com/rodcast)\n- [Twitter](https://twitter.com/rodcast)\n- [LinkedIn](https://www.linkedin.com/in/rodcast)\n- [Medium](https://medium.com/@rodcast)",
  "emergingProtocols": {
    "oauthProtectedResource": {
      "exists": true,
      "url": "https://rodrigocastilho.com/.well-known/oauth-protected-resource",
      "resource": "https://rodrigocastilho.com/",
      "authorizationServers": [
        "https://rodrigocastilho.com"
      ],
      "scopesSupported": [
        "profile:read",
        "content:read"
      ]
    },
    "oauthDiscovery": {
      "exists": true,
      "url": "https://rodrigocastilho.com/.well-known/oauth-authorization-server",
      "issuer": "https://rodrigocastilho.com",
      "authorizationEndpoint": null,
      "tokenEndpoint": "https://rodrigocastilho.com/oauth/token",
      "grantTypesSupported": [
        "urn:ietf:params:oauth:grant-type:jwt-bearer",
        "urn:workos:agent-auth:grant-type:claim"
      ],
      "scopesSupported": [
        "profile:read",
        "content:read"
      ]
    },
    "mcpServerCard": {
      "exists": true,
      "url": "https://rodrigocastilho.com/.well-known/mcp/server-card.json",
      "draft": true,
      "name": null,
      "version": null,
      "description": null,
      "transport": null,
      "tools": null,
      "resources": null,
      "prompts": null
    },
    "a2aAgentCard": {
      "exists": true,
      "url": "https://rodrigocastilho.com/.well-known/agent-card.json",
      "name": "Rodrigo Castilho Personal Website Agent",
      "version": "1.0.0",
      "description": "A read-only agent that provides information about Rodrigo Castilho's profile, public GitHub repositories, and Medium articles via WebMCP browser tools.",
      "capabilities": 2,
      "skills": 4,
      "endpoint": null
    },
    "apiCatalog": {
      "exists": true,
      "url": "https://rodrigocastilho.com/.well-known/api-catalog",
      "contentType": "application/octet-stream",
      "validMediaType": false,
      "apis": 1
    },
    "agentSkills": {
      "exists": true,
      "url": "https://rodrigocastilho.com/.well-known/agent-skills/index.json",
      "draft": true,
      "schema": "https://agentskills.io/schemas/agent-skills-index.v0.2.0.json",
      "skills": 5,
      "names": [
        "api-discovery",
        "markdown-negotiation",
        "auth-discovery",
        "webmcp-tools",
        "web-bot-auth"
      ]
    },
    "count": 6,
    "total": 6
  },
  "botAccess": {
    "probed": true,
    "bot": "OAI-SearchBot",
    "controlStatus": 200,
    "botStatus": 200,
    "discriminates": false,
    "refusedAsBot": false,
    "edge": "Fastly",
    "verifiable": false,
    "detail": "This origin answers OAI-SearchBot exactly as it answers any other client (200). No edge-level filtering of AI crawlers observed."
  },
  "snippets": [
    {
      "id": "add_content_signals",
      "title": "Add Content-Signal directives",
      "description": "Content-Signal tells AI agents how they may use your content. The canonical location is robots.txt, but you can also expose it as an HTTP header from any stack.",
      "language": "txt",
      "code": "User-agent: *\nContent-Signal: search=yes, ai-input=yes, ai-train=no",
      "filename": "/robots.txt",
      "stacks": [
        {
          "id": "robots",
          "label": "robots.txt",
          "language": "txt",
          "filename": "/robots.txt",
          "code": "User-agent: *\nContent-Signal: search=yes, ai-input=yes, ai-train=no"
        },
        {
          "id": "nginx",
          "label": "Nginx",
          "language": "nginx",
          "filename": "server block",
          "code": "# Inside your server { } block:\nadd_header Content-Signal \"search=yes, ai-input=yes, ai-train=no\" always;"
        },
        {
          "id": "apache",
          "label": "Apache",
          "language": "apache",
          "filename": ".htaccess",
          "code": "# In .htaccess (or VirtualHost):\nHeader set Content-Signal \"search=yes, ai-input=yes, ai-train=no\""
        },
        {
          "id": "wordpress",
          "label": "WordPress",
          "language": "php",
          "filename": "functions.php",
          "code": "<?php\n// In your theme's functions.php or a small mu-plugin\nadd_action('send_headers', function () {\n    header('Content-Signal: search=yes, ai-input=yes, ai-train=no');\n});\n\n// Optional: also append the directive to the dynamic robots.txt\nadd_filter('robots_txt', function ($output) {\n    return $output . \"\\nContent-Signal: search=yes, ai-input=yes, ai-train=no\\n\";\n}, 10, 1);"
        },
        {
          "id": "nextjs",
          "label": "Next.js",
          "language": "typescript",
          "filename": "middleware.ts",
          "code": "// middleware.ts (Next.js 13+ App Router or Pages Router)\nimport { NextResponse } from 'next/server';\nexport function middleware() {\n  const res = NextResponse.next();\n  res.headers.set(\n    'Content-Signal',\n    'search=yes, ai-input=yes, ai-train=no'\n  );\n  return res;\n}\nexport const config = { matcher: '/:path*' };"
        },
        {
          "id": "cloudflare",
          "label": "Cloudflare Workers",
          "language": "javascript",
          "filename": "worker.js",
          "code": "// Cloudflare Worker that proxies your origin and adds the header\nexport default {\n  async fetch(request, env, ctx) {\n    const res = await fetch(request);\n    const newRes = new Response(res.body, res);\n    newRes.headers.set(\n      'Content-Signal',\n      'search=yes, ai-input=yes, ai-train=no'\n    );\n    return newRes;\n  },\n};"
        },
        {
          "id": "express",
          "label": "Express / Fastify",
          "language": "javascript",
          "filename": "server.js",
          "code": "// Express\napp.use((req, res, next) => {\n  res.setHeader('Content-Signal', 'search=yes, ai-input=yes, ai-train=no');\n  next();\n});\n\n// Fastify\nfastify.addHook('onSend', (request, reply, payload, done) => {\n  reply.header('Content-Signal', 'search=yes, ai-input=yes, ai-train=no');\n  done();\n});"
        }
      ]
    }
  ]
}

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