docs: add ColdProxy proxy-backed crawling walkthrough

README.md

@@ -142,7 +142,7 @@ webclaw https://docs.rust-lang.org --crawl --depth 2 --max-pages 50
 - [HTML to Markdown for RAG](examples/html-to-markdown-rag/)
 - [Firecrawl-compatible API](examples/firecrawl-compatible-api/)
 - [MCP web scraping](examples/mcp-web-scraping/)
-- [Proxy-backed crawling](examples/proxy-backed-crawling/)
+- [Proxy-backed crawling with ColdProxy](examples/proxy-backed-crawling/)
 - [Cloudflare diagnostics](examples/cloudflare-diagnostics/)
 
 ### Extract brand assets
@@ -401,6 +401,8 @@ Please remove secrets, cookies, private tokens, and customer data from logs befo
       residential IPv6, and datacenter IPv6 proxy infrastructure across 195+ countries for public data
       collection, regional testing, monitoring, and web scraping workflows. Explore
       <a href="https://coldproxy.com/">ColdProxy</a>'s latest plans and available offers directly on the website.
+      See the <a href="examples/proxy-backed-crawling/#using-coldproxy">proxy-backed crawling guide</a>
+      for a hands-on walkthrough of wiring ColdProxy into webclaw.
     </td>
   </tr>
 </table>

examples/proxy-backed-crawling/README.md

@@ -1,6 +1,68 @@
 # Proxy-Backed Crawling
 
-Use proxy rotation when you need to distribute a crawl across a proxy pool. webclaw supports a single proxy or a proxy file.
+Use proxy rotation when you need to distribute a crawl across a proxy pool. webclaw supports a single proxy or a proxy file, and accepts any standard HTTP/HTTPS or SOCKS5 proxy URL.
+
+## Using ColdProxy
+
+[ColdProxy](https://coldproxy.com/) is webclaw's infrastructure partner, providing residential IPv4, residential IPv6, and datacenter IPv6 proxies across 195+ countries. Use a ColdProxy endpoint as a full URL with `--proxy` / `WEBCLAW_PROXY`, or list several in a `--proxy-file` pool.
+
+### 1. Get your endpoint
+
+Sign in to your [ColdProxy dashboard](https://coldproxy.com/) and copy your proxy host, port, and credentials. Assemble them into a standard proxy URL:
+
+```text
+http://USERNAME:PASSWORD@HOST:PORT
+```
+
+### 2. One ColdProxy endpoint
+
+```bash
+export WEBCLAW_PROXY="http://USERNAME:PASSWORD@HOST:PORT"
+webclaw https://example.com --format markdown
+```
+
+Or pass it inline:
+
+```bash
+webclaw https://example.com \
+  --proxy "http://USERNAME:PASSWORD@HOST:PORT" \
+  --format markdown
+```
+
+### 3. Rotate a ColdProxy pool
+
+List one ColdProxy endpoint per line in `coldproxy.txt`. Pool files use `host:port:user:pass` (one entry per line; lines starting with `#` are ignored). Mix product types and regions to match your workload:
+
+```text
+# residential IPv4
+HOST:PORT:USERNAME:PASSWORD
+# residential IPv6
+HOST:PORT:USERNAME:PASSWORD
+# datacenter IPv6
+HOST:PORT:USERNAME:PASSWORD
+```
+
+webclaw rotates across the pool per request:
+
+```bash
+webclaw https://docs.example.com \
+  --crawl \
+  --depth 2 \
+  --max-pages 200 \
+  --concurrency 10 \
+  --delay 200 \
+  --proxy-file coldproxy.txt \
+  --format markdown
+```
+
+### 4. Target a country
+
+ColdProxy offers access across 195+ countries. Use the country-specific endpoint from your ColdProxy dashboard for each region you want to collect from (for example, a France residential endpoint for fr-localized pages). Add one endpoint per country to your pool file to spread a single crawl across regions.
+
+### Choosing a product
+
+- **Residential IPv4 / IPv6** — highest trust; best for consumer sites, geo-restricted content, and regional QA.
+- **Datacenter IPv6** — fastest and most cost-effective; best for high-volume crawling of tolerant endpoints.
 
 ## Single Proxy
 
@@ -20,12 +82,12 @@ webclaw https://example.com \
 
 ## Proxy Pool
 
-Create `proxies.txt` with one proxy per line:
+Create `proxies.txt` with one proxy per line in `host:port:user:pass` format (lines starting with `#` are ignored):
 
 ```text
-http://user:pass@proxy-1.example.com:8080
-http://user:pass@proxy-2.example.com:8080
-http://user:pass@proxy-3.example.com:8080
+proxy-1.example.com:8080:user:pass
+proxy-2.example.com:8080:user:pass
+proxy-3.example.com:8080:user:pass
 ```
 
 Run a crawl with controlled concurrency: