Backconnect Proxy Service Guide with GoProxy (2025)
Learn how backconnect proxy services work, their benefits, drawbacks, and how to use for web scraping and more.
Jul 8, 2025
Enable and customize redirect handling in curl, preserve methods, debug chains, and integrate GoProxy for reliable scraping.
Handling HTTP redirects is a core skill for anyone using curl—whether you’re testing web endpoints, automating API workflows, or scraping data behind login redirects. Without handling, curl stops at the first 3xx status. This guide builds step by step, from the basics to advanced techniques (including proxy integration) to master every redirection scenario.
Get up and running in seconds—follow your first redirect.
A server responds with a 3xx status (e.g., 301, 302) and a Location: header pointing to a new URL.
bash
curl -L https://example.com/old-page
Learn how to cap redirects so you never get stuck in a loop.
Avoid infinite loops or accidental long chains that hang your script.
Most curl versions use 30 hops by default; some use 50 (varies by curl version).
bash
curl -L --max-redirs 5 https://example.com/chain
Pro Tip: If you expect only one redirect but want safety, set --max-redirs 2.
Preserve your POST requests when URLs bounce you around.
By default, curl -L converts POST → GET after 301/302/303, dropping your request body.
bash
curl -X POST -d '{"user":"alice"}' \
--post301 --post302 --post303 \
-H "Content-Type: application/json" \
-L https://api.example.com/login
Scenario Example: Automating a login that first redirects to a captcha page, then to your dashboard—this flag combo keeps your credentials intact.
For libcurl in C code:
c
curl_easy_setopt(curl, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
Use verbose and header-only flags to peek under the hood.
bash
curl -v -L https://example.com
bash
curl -I -L https://example.com
Pro Tip: Combine silent and verbose to see headers but suppress the progress meter:
bash
curl -s -v -L https://example.com
Send cookies and tokens across domains—securely.
By default, auth headers and cookies are NOT sent to new hosts.
bash
curl -L --location-trusted \
-b cookies.txt \
-H "Authorization: Bearer $TOKEN" \
https://secure.example.com/start
Security Caution: Only use --location-trusted when you fully trust the redirect targets.
Why curl can’t click meta‑refresh or JS links—and what to do instead.
[ Start URL ]
|
(meta-refresh / JS)
↓
[ Final Content ]
curl limitation: Does not execute HTML <meta> refreshes or JavaScript navigations.
For those, you can choose to combine a headless-browser tool (e.g., Puppeteer), or use a scraping API to process automatically.
When you face geo-blocks or rate limits, route your requests through GoProxy:
bash
curl -x http://user:[email protected]:8000 \
-L --max-redirs 10 \
-A "Mozilla/5.0" \
-s \
https://data.example.org/redirect-me
Scenario Example: Gathering SEO metrics from region-locked pages—GoProxy ensures you follow every redirect as if you were local.
For most web-scraping and redirect-handling use cases, we recommend:
Choose the right mix based on your target site’s sensitivity, speed requirements, and budget.
Problem | Fix |
Infinite redirect loops | Set --max-redirs 5 |
POST becomes GET after redirect | Use --post301/302/303 |
Auth tokens not forwarded | Add --location-trusted (trusted domains only) |
Meta-refresh / JS redirects unsupported | Use headless browser or a scraping API |
Unexpected failures | Run with -v -L or -I -L to inspect headers |
1. Always opt in with -L.
2. Cap your hops via --max-redirs.
3. Preserve methods with --postXXX flags when needed.
4. Debug early using -v or -I.
5. Use a reliable proxy service for geo-targeting and anti-bot circumvention, like GoProxy.
6. Avoid leaking credentials—trust only known domains with --location-trusted.
From your first curl -L command to complex login chains and proxy-backed scraping, this guide equips you to handle every redirect pattern. Adapt these steps to your workflows today!
< Previous
Next >