Robots.txt configuration in SEO Fundamentals - Step-by-Step Execution

Concept Flow - Robots.txt configuration

Start: Browser or Bot Requests URL

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Check for robots.txt file

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Allow full access

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Read robots.txt rules

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Match User-agent

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Check Disallow/Allow rules

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Decide if URL is Allowed

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Block URL from crawling

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Allow URL to be crawled

When a bot visits a website, it looks for robots.txt to find rules about which pages it can or cannot visit.

Execution Sample

SEO Fundamentals

User-agent: *
Disallow: /private/
Allow: /private/public-info.html

This robots.txt blocks all bots from /private/ folder except the file /private/public-info.html

Analysis Table

Step	Action	Input	Rule Matched	Decision
1	Bot requests URL	/private/data.html	N/A	Check robots.txt
2	Read robots.txt	User-agent: *	Matches all bots	Continue
3	Check Disallow	/private/	Matches prefix of URL	Disallow applies
4	Check Allow	/private/public-info.html	Does not match URL	No Allow override
5	Final decision	/private/data.html	Disallow	Block crawling
6	Bot requests URL	/private/public-info.html	N/A	Check robots.txt
7	Read robots.txt	User-agent: *	Matches all bots	Continue
8	Check Disallow	/private/	Matches prefix	Disallow applies
9	Check Allow	/private/public-info.html	Exact match	Allow overrides Disallow
10	Final decision	/private/public-info.html	Allow	Allow crawling
11	Bot requests URL	/public/page.html	N/A	Check robots.txt
12	Read robots.txt	User-agent: *	Matches all bots	Continue
13	Check Disallow	/private/	Does not match URL	No Disallow
14	Final decision	/public/page.html	No rules matched	Allow crawling

💡 Decisions made based on matching rules; URLs either allowed or blocked accordingly.

State Tracker

Variable	Start	After Step 3	After Step 4	After Step 5	After Step 9	After Step 10	After Step 14
URL	N/A	/private/data.html	/private/data.html	/private/data.html	/private/public-info.html	/private/public-info.html	/public/page.html
Disallow Matched	False	True	True	True	True	True	False
Allow Matched	False	False	False	False	False	True	False
Final Decision	N/A	N/A	N/A	Block	N/A	Allow	Allow

Key Insights - 3 Insights

Why does /private/public-info.html get allowed even though /private/ is disallowed?

Because the Allow rule for /private/public-info.html is more specific and overrides the broader Disallow for /private/ as shown in steps 8-10.

What happens if there is no robots.txt file?

Bots assume no restrictions and crawl all pages, as shown in the flow where 'No' robots.txt leads to full access.

Does the order of rules in robots.txt matter?

Yes, but the most specific rule for a URL takes priority regardless of order, as seen in the Allow overriding Disallow for a specific file.

Visual Quiz - 3 Questions

Look at the execution table, what is the final decision for the URL '/private/data.html' at step 5?

A Block crawling

B Allow crawling

C No decision made

D Partial access

💡 Hint

Check the 'Final Decision' column at step 5 in the execution_table.

At which step does the Allow rule override the Disallow rule for '/private/public-info.html'?

A Step 4

B Step 8

C Step 9

D Step 10

💡 Hint

Look at the 'Allow Matched' and 'Final Decision' columns around steps 8-10.

If the Disallow rule was removed, what would be the final decision for '/private/data.html'?

A Block crawling

B Allow crawling

C No robots.txt found

D Depends on User-agent

💡 Hint

Refer to the variable_tracker and execution_table rows where no Disallow means allow by default.

Concept Snapshot

Robots.txt tells bots which parts of a website to crawl or avoid.
Use 'User-agent' to specify bots.
'Allow' and 'Disallow' set access rules.
More specific rules override broader ones.
If no robots.txt, bots crawl everything.

Full Transcript

When a bot visits a website, it first looks for a robots.txt file. If found, it reads the rules inside. These rules specify which parts of the site the bot can or cannot visit. The bot matches its name to the 'User-agent' rules. Then it checks 'Disallow' and 'Allow' paths to decide if it can crawl a URL. More specific rules override general ones. If no robots.txt exists, bots assume they can crawl all pages. For example, if '/private/' is disallowed but '/private/public-info.html' is allowed, the bot will crawl the allowed file but not the rest of the private folder.