markdown-fetch（Markdown fetch 控制）

Markdown Fetch

Efficiently fetch web content as clean Markdown using the markdown.new service.

Why Use This

• 80% fewer tokens than raw HTML
• 5x more content fits in context window
• No external dependencies or parsing libraries needed
• Three-tier conversion (Markdown-first, AI fallback, browser rendering)

Triggering

This skill should trigger automatically when:

• User provides a URL (e.g., "Read https://example.com")
• User asks to extract/fetch/analyze web content
• User requests summarization of a webpage
• User needs to process article/blog/documentation URLs

Quick Start

# Fetch any URL
scripts/fetch.sh "https://example.com"

# Use browser rendering for JS-heavy sites
scripts/fetch.sh "https://example.com" --method browser

# Retain images in output
scripts/fetch.sh "https://example.com" --retain-images

Typical Usage Patterns

When a user says:

• "Read this article: https://..." → Use this skill to fetch the content
• "Summarize https://..." → Fetch with this skill first, then summarize
• "What does this page say: https://..." → Fetch the content
• "Extract the text from https://..." → Use this skill

Conversion Methods

auto (default) - Try Markdown-first, fall back to AI or browser as needed ai - Use Cloudflare Workers AI for conversion browser - Full browser rendering for JS-heavy content

Options

--method <auto|ai|browser> - Conversion method --retain-images - Keep image references in output --output <file> - Save to file instead of stdout

Output

Returns clean Markdown with metadata:

---
title: Page Title
url: https://example.com
method: auto
duration_ms: 725
fetched_at: 2026-03-07T12:00:00Z
---

# Content here...

When to Use

• Extracting articles, documentation, or blog posts
• Building RAG pipelines with web content
• Summarizing web pages
• Fetching content for analysis
• Converting sites to Markdown format

Implementation Notes

The service handles:

• Content negotiation (Accept: text/markdown)
• Cloudflare Workers AI conversion
• Browser rendering for dynamic content
• Automatic fallback between methods

Common Pitfalls

HTML Parsing Failures

Symptom: Empty output, truncated content, or "Error: No content in response"

Root Causes:

• CSS selectors broken by page layout changes
• Dynamic content not rendered by default (use --method browser)
• Page structure uses unusual HTML patterns (iframes, shadow DOM, Web Components)

Debugging & Workarounds:

# 1. Check if the page loads at all
curl -s "https://example.com" | head -c 500

# 2. Try browser rendering (handles JS-heavy sites)
scripts/fetch.sh "https://example.com" --method browser

# 3. Check what the service is getting
scripts/fetch.sh "https://example.com" 2>&1 | head -20

# 4. If still empty, the page may use iframes or require auth

Best Practice: Always use --method browser for single-page apps, social platforms, or content-heavy dashboards.

Rate Limiting & IP Blocks

Symptom: HTTP 429 (Too Many Requests), 403 (Forbidden), or connection timeouts

Root Causes:

• Multiple rapid requests to same domain
• Service IP address blacklisted by the target site
• Bot detection triggering (User-Agent headers, request patterns)
• Cloudflare/WAF blocks (common on high-traffic sites)

Debugging & Workarounds:

# 1. Check HTTP status code
curl -s -w "\n%{http_code}\n" -o /dev/null "https://example.com"

# 2. Test with curl directly (bypasses service)
curl -H "User-Agent: Mozilla/5.0" "https://example.com" | head -c 500

# 3. Add delays between requests (if fetching multiple URLs)
for url in url1 url2 url3; do
  scripts/fetch.sh "$url"
  sleep 5  # Wait 5 seconds between requests
done

# 4. If blocked, try from different IP or use residential proxy
# For markdown.new service: no built-in proxy rotation; consider mirror services

Best Practice: Respect site robots.txt and use sensible request delays when processing multiple pages. Some sites require retry-after headers.

Encoding Issues

Symptom: Garbled text, mojibake (weird characters), missing non-ASCII content (emojis, accents, CJK)

Root Causes:

• Page declares wrong charset in headers vs actual content
• Service not respecting Content-Type charset declaration
• UTF-8 vs Latin-1 mismatch
• Emoji or special symbols stripped during conversion

Debugging & Workarounds:

# 1. Check the page's declared charset
curl -sI "https://example.com" | grep -i "charset"

# 2. Save raw HTML and inspect encoding
curl -s "https://example.com" > raw.html
file raw.html
head -c 200 raw.html | od -c  # Show raw bytes

# 3. Try the markdown.new service and check output
scripts/fetch.sh "https://example.com" | file -  # Check output encoding

# 4. If output is garbled, convert explicitly
scripts/fetch.sh "https://example.com" | iconv -f UTF-8 -t UTF-8 > fixed.md

Best Practice: Always verify output is valid UTF-8. If encountering garbled content, the page likely has a charset mismatch — notify the site owner or use --method browser (more robust).

JavaScript-Rendered Content

Symptom: Page returns but content is missing, loads as empty, or shows loading spinners instead of data

Root Causes:

• Page uses client-side JavaScript to render content (React, Vue, Angular, etc.)
• Default auto method only fetches HTML skeleton without executing JS
• Content loaded after page render (lazy loading, infinite scroll)
• JavaScript requires authentication or API keys

Debugging & Workarounds:

# 1. Fetch with browser rendering (executes JS)
scripts/fetch.sh "https://example.com" --method browser

# 2. Check what the auto method returns
scripts/fetch.sh "https://example.com" --method auto

# 3. Inspect page source to confirm JS-rendering
curl -s "https://example.com" | grep -i "react\|vue\|angular\|<div id=\"app\""

# 4. If content still missing, page may require interaction
# (e.g., clicking buttons, scrolling) — no workaround in current service

Best Practice: Use --method browser by default for modern web apps, news sites, and any site built in the last 5 years. The auto method is faster but misses JS-rendered content.

Authentication & Paywall Content

Symptom: Returns login page instead of content, shows "Subscribe to read more", or HTTP 401/403

Root Causes:

• Page requires login/authentication
• Content behind paywall (subscription, membership)
• IP-based access restrictions (geo-blocking)
• Session-based authentication (cookies) not provided

Debugging & Workarounds:

# 1. Check if curl can access without auth
curl -s "https://example.com/article" | head -c 300

# 2. Identify authentication method
curl -sI "https://example.com" | grep -i "auth\|set-cookie\|www-authenticate"

# 3. Try public/preview version if available
# For paywalled sites, look for preview URLs or RSS feeds
curl -s "https://example.com/rss" | head -c 500

# 4. Check for paywall indicators
curl -s "https://example.com/article" | grep -i "paywall\|subscribe\|login required"

# 5. If member-only, request your credentials in the conversation
# (Don't embed in scripts — use prompt)

Best Practice: This skill cannot bypass authentication or paywalls by design. For protected content:

• Use public preview links if available
• Ask the user for authenticated access
• Try RSS feeds (often unpaywalled summaries)
• Check archive services (archive.org, 12ft.io for paywalled content) separately

Service-Side Failures

Symptom: HTTP error codes (5xx), timeout, or malformed JSON responses

Root Causes:

• markdown.new service is down or overloaded
• Request body malformed (invalid URL, missing required fields)
• Service response is corrupted or incomplete
• Cloudflare Workers timeout (pages >10MB or slow servers)

Debugging & Workarounds:

# 1. Check service health
curl -s "https://markdown.new/health" 2>&1 | head

# 2. Verify request format
jq -n --arg url "https://example.com" --arg method "auto" \
  '{url: $url, method: $method, retain_images: false}' | jq .

# 3. Retry with exponential backoff
for attempt in {1..3}; do
  result=$(scripts/fetch.sh "https://example.com" 2>&1)
  if [[ $? -eq 0 ]]; then
    echo "$result"
    break
  fi
  sleep $((2 ** attempt))  # 2s, 4s, 8s
done

# 4. If service is down, no workaround available
# — try again later or use alternative (curl, browser, etc.)

Best Practice: The service is stateless and generally reliable. If failures persist, fall back to curl directly or ask the user for an alternative source.

Troubleshooting Decision Tree

No content returned?
  ├─ Check if site requires JavaScript
  │   └─ YES → Use --method browser
  │   └─ NO → Continue
  ├─ Check if site requires authentication
  │   └─ YES → Use authenticated request (see Paywall section)
  │   └─ NO → Continue
  ├─ Check for encoding issues
  │   └─ YES → Garbled text → likely site charset mismatch
  │   └─ NO → Continue
  └─ Service may be down → Wait and retry

Getting rate-limited (HTTP 429)?
  ├─ Add delays between requests (5-10 seconds)
  └─ If persistent, try different time or request fewer pages

Truncated or broken output?
  └─ Try --method browser (more robust but slower)

Can't access paywalled content?
  └─ No workaround — try public preview, RSS, or archive services