HTTPS / 301 / 404: How Should These Technical Details Be Handled?

Chapter 2: Search Fundamentals · Question 31

HTTPS, 301 redirects, and 404 error pages—these three seemingly basic technical details, if handled poorly, can cause rankings to plummet, traffic to be lost, and user experience to collapse. Especially in the Baidu ecosystem, the recovery period for these issues is often longer than on Google, so you must get them right the first time.

HTTPS Migration: A Complete Checklist for the Baidu Environment

Baidu has clearly stated that HTTPS is a ranking bonus and will prioritize HTTPS pages in search results. Migration steps:

1. Certificate Selection

• Free option: Let’s Encrypt (auto-renewal, suitable for small and medium-sized sites)
• Paid option: DigiCert, GlobalSign (recommended for enterprise sites and e-commerce, with insurance coverage)
• Domestic option: Alibaba Cloud free certificates, Tencent Cloud free certificates (one-click deployment, suitable for site owners using their servers)

2. Site-wide Redirect Configuration

Nginx configuration example:

server {
    listen 80;
    server_name example.com www.example.com;
    return 301 https://$server_name$request_uri;
}

3. Must-Do Items After Migration

• Updatesitemapall URLs in to the HTTPS version
• Updatecanonicaltag to HTTPS
• When searching for theBaidu SearchReverify the HTTPS site on the resource platform
• Submit HTTPS certification (Baidu Webmaster Platform → HTTPS Certification)
• Check pages forinternal linkswhether any HTTP hardcoding remains (mixed content issues)
• Update third-party platforms'backlinkspointers (change what can be changed; rely on 301 as a fallback for what cannot)

Common pitfall: Some CDNs use HTTP for origin fetch by default, causing search engines to still see the HTTP version. Be sure to confirm that the CDN is also configured for HTTPS origin fetch.

301 Redirects: Be Patient with Baidu's Slow Pace

A 301 is a permanent redirect, telling search engines "this page has permanently moved to a new address." Baidu processes 301s much more slowly than Google—typically taking 1-3 months to fully pass link equity.

When to use a 301:

• Changing the website domain
• URL structure adjustments (e.g., from/article/123to/blog/seo-tips）
• HTTP migration to HTTPS
• Delete the page but have corresponding new content to take over
• Merge multiple similar pages

301 best practices:

Baidu special notes:

• Submit "redesign rules" in Baidu Webmaster Platform to accelerate Baidu's recognition of 301
• Path: Search Services → Website Redesign → Add Redesign Rules
• Supports three methods: site redesign, rule redesign, old/new URL pair submission

Chained redirect detection: Use Screaming Frog to crawl the entire site, filter out all redirect chains, and fix each one to a direct redirect.

Custom 404 page: balancing users and SEO

When users visit a non-existent page, a good 404 page can save traffic, while a bad 404 page will make users close the tab immediately.

SEO requirements:

• The server must return a 404 status code (not a 200 status code displaying "page not found" content, which is called a "soft 404" and wastes crawl budget)
• Do not uniformly 301 redirect 404 pages to the homepage (Baidu will treat it as a soft 404)
• 404 page itself settings<meta name="robots" content="noindex">

User experience design:

• Friendly prompt text (“The page you visited does not exist”)
• Provide a search box so users can search themselves
• Recommend popular content or related page links
• Provide a button to return to the homepage
• Keep website navigation; do not use a blank page

Example text：

Sorry, the page you are looking for may have been removed or the address may be incorrect.
Try searching for what you need, or browse our popular articles

How to audit broken links

Broken links not only hurt user experience but also waste Baidu's crawling quota; too many broken links will reduce Baidu's trust in the site.

Audit tools:

• Baidu Site Owner Platform → Crawl exceptions: directly view broken links discovered by Baidu
• Screaming Frog: crawl the entire site and filter for 4xx status codes
• Xenu Link Sleuth: a veteran free tool, suitable for small and medium-sized sites
• Ahrefs Site Audit: paid but powerful

Handling priority after discovering broken links:

1. Corresponding new content exists → set up a 301 redirect
2. No corresponding content but there is traffic → restore the page or 301 to the most relevant page
3. No traffic and no value → keep the 404 and submit the broken link on Baidu Site Owner Platform
4. Bulk broken links → use the "broken link submission" feature on Baidu Site Owner Platform to let Baidu quickly remove them from the index

Practical recommendations

• Schedule HTTPS migration during a traffic trough: such as early morning on weekends, giving search engines a buffer period and time to fix issues if problems arise
• Continuously monitor for 3 months after completing the 301: observe index volume and traffic changes in Baidu Site Owner Platform and Google Search Console to confirm that authority is passing normally
• Do a full-site broken link audit every quarter: scan with Screaming Frog and promptly handle newly generated broken links to maintain the site's "health score"

Solve with AI tools: automation of 301 / 404 / HTTPS migration

Scenario 1: Bulk-generate a 301 mapping table

My website is being redesigned. The old site has these URLs (paste the old URL list), and the new site's URL rule is [e.g., /blog/ prefix + title slug]. Please help me generate a corresponding new URL for each old URL based on the principle of "closest semantic match", output as a CSV in the format "oldURL,newURL", and flag entries that cannot be clearly matched. Please do not point multiple old URLs to the same new URL.

Scenario 2: Convert the 301 mapping table into an Nginx configuration

This is a 301 mapping table of oldURL,newURL (paste the first 50 entries). Please help me generate an Nginx configuration: use return 301 to redirect each entry individually, avoid chained redirects (A→B→C), and provide a server block example for "301 all URLs to the new domain". Also explain where each rule should be placed.

Scenario 3: Write a "non-scary" 404 page

Please help me write a 404 page: friendly and not scary, with brand feel, an on-site search box, 3 recommended popular articles (I'll provide the titles), and a back-to-home button. Output HTML + inline CSS, and explain how to set the server to return the 404 status code and add noindex to the page.

Scenario 4: Analyze the broken link report and determine handling priority

This is the broken link list I exported with a crawler tool (paste URL + status code). Please help me categorize: 1) those with a similar new page that can be 301'd; 2) false broken links possibly caused by formatting/link errors; 3) those with no value that can remain 404. Output a table in "priority handling order" with handling suggestions for each entry.

Note: the boundaries of AI

• 301 mappings must be manually confirmed: the correspondences AI guesses based on "semantic similarity" may point important pages to the wrong place; always verify the mappings of core pages yourself
• Don't let AI modify the server directly: Nginx configs it generates must be validated in a test environment by someone with server permissions before being applied; back up first, then change
• AI doesn't know your business: which URLs should 301 and which should stay 404 depends on traffic and business value; AI can only offer suggestions, the decision is yours