updates

PR_DESCRIPTION.md

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+# Fix: Sitemap Not Updating in CI/CD
+
+## 🐛 The Problem
+
+The user reported that `sitemap.xml` was buggy or not being read correctly by Google Search Console.
+Upon investigation, it was found that the deployed `sitemap.xml` might be stale or not reflecting the latest routes because the generation script was not running during the automated deployment.
+
+## 🔍 Root Cause Analysis
+
+In `package.json`, the build script is defined as:
+
+```json
+"build": "npm run generate:sitemap && next build"
+```
+
+This script ensures that the sitemap is regenerated **before** the Next.js build occurs.
+
+However, the GitHub Actions workflow (`.github/workflows/release.yml`) was explicitly running:
+
+```yaml
+run: npx next build
+```
+
+By running `next build` directly via `npx`, the CI pipeline was **bypassing** the `npm run generate:sitemap` step defined in `package.json`. Consequently, the sitemap in the `out/` directory was either missing, stale, or relying on a previously committed version.
+
+## 🛠 The Solution
+
+I have updated the `.github/workflows/release.yml` file to use the project's defined build script instead of the default Next.js command.
+
+**Change:**
+
+```diff
+- run: npx next build
++ run: npm run build
+```
+
+## ✅ Verification Steps
+
+To verify this fix:
+
+1. **Merge** this pull request.
+2. Go to the **Actions** tab in GitHub.
+3. Open the running **Release and Build** workflow.
+4. Click on the **build** step.
+5. Verify that you see the output `✅ Sitemap generated...` in the logs before the Next.js build starts.
+6. Once deployed, check `https://physicshub.github.io/sitemap.xml` to ensure it matches the latest content.

check-local-sitemap.cjs

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+
+const http = require('http');
+
+const url = 'http://localhost:8000/sitemap.xml';
+
+http.get(url, (res) => {
+    console.log('StatusCode:', res.statusCode);
+    console.log('Headers:', res.headers);
+}).on('error', (e) => {
+    console.error(e);
+});

check-sitemap.cjs

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+
+const https = require('https');
+
+const url = 'https://physicshub.github.io/sitemap.xml';
+
+https.get(url, (res) => {
+    console.log('StatusCode:', res.statusCode);
+    console.log('Headers:', res.headers);
+
+    let data = '';
+    res.on('data', (chunk) => {
+        data += chunk;
+    });
+
+    res.on('end', () => {
+        console.log('Body snippet:', data.substring(0, 200));
+    });
+
+}).on('error', (e) => {
+    console.error(e);
+});

fetch-robots.cjs

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+
+const https = require('https');
+
+https.get('https://physicshub.github.io/robots.txt', (res) => {
+    console.log('StatusCode:', res.statusCode);
+    res.pipe(process.stdout);
+});

sitemap_live.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:news="http://www.google.com/schemas/sitemap-news/0.9" xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:image="http://www.google.com/schemas/sitemap-image/1.1" xmlns:video="http://www.google.com/schemas/sitemap-video/1.1">
+  <url>
+    <loc>https://physicshub.github.io/</loc>
+    <changefreq>weekly</changefreq>
+    <priority>1.0</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/contribute</loc>
+    <changefreq>monthly</changefreq>
+    <priority>0.8</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/simulations</loc>
+    <changefreq>weekly</changefreq>
+    <priority>0.9</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/about</loc>
+    <changefreq>monthly</changefreq>
+    <priority>0.7</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/blog</loc>
+    <changefreq>weekly</changefreq>
+    <priority>0.9</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/blog/create</loc>
+    <changefreq>monthly</changefreq>
+    <priority>0.7</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/simulations/BouncingBall</loc>
+    <changefreq>weekly</changefreq>
+    <priority>0.7</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/simulations/VectorsOperations</loc>
+    <changefreq>weekly</changefreq>
+    <priority>0.7</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/simulations/BallAcceleration</loc>
+    <changefreq>weekly</changefreq>
+    <priority>0.7</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/simulations/BallGravity</loc>
+    <changefreq>weekly</changefreq>
+    <priority>0.7</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/simulations/SpringConnection</loc>
+    <changefreq>weekly</changefreq>
+    <priority>0.7</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/simulations/SimplePendulum</loc>
+    <changefreq>weekly</changefreq>
+    <priority>0.7</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/simulations/ParabolicMotion</loc>
+    <changefreq>weekly</changefreq>
+    <priority>0.7</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/blog/physics-bouncing-ball-comprehensive-educational-guide</loc>
+    <changefreq>monthly</changefreq>
+    <priority>0.8</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/blog/comprehensive-guide-to-vector-operations</loc>
+    <changefreq>monthly</changefreq>
+    <priority>0.8</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/blog/ball-uniformly-accelerated-motion</loc>
+    <changefreq>monthly</changefreq>
+    <priority>0.8</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/blog/ball-free-fall-comprehensive-guide</loc>
+    <changefreq>monthly</changefreq>
+    <priority>0.8</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/blog/spring-connection</loc>
+    <changefreq>monthly</changefreq>
+    <priority>0.8</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/blog/pendulum-motion</loc>
+    <changefreq>monthly</changefreq>
+    <priority>0.8</priority>
+  </url>
+  <url>
+    <loc>https://physicshub.github.io/blog/projectile-parabolic-motion</loc>
+    <changefreq>monthly</changefreq>
+    <priority>0.8</priority>
+  </url>
+</urlset>

validate-xml.cjs

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+
+const fs = require('fs');
+const { XMLValidator } = require('fast-xml-parser');
+
+try {
+    const xmlData = fs.readFileSync('sitemap_live.xml', 'utf8');
+
+    // Check for leading whitespace
+    if (xmlData.trimStart() !== xmlData) {
+        console.log("WARNING: Found leading whitespace/newlines!");
+    }
+
+    // Validate
+    const result = XMLValidator.validate(xmlData);
+    if (result === true) {
+        console.log("XML is Valid");
+    } else {
+        console.log("XML Invalid:", result);
+    }
+} catch (err) {
+    console.error("Error reading file:", err);
+}