SEO Course gold shield emblem

SEO COURSE
SITETRAIL CERTIFIED

Course outlineSkills assessment3-minute challenge

Your learning path: 93 lessons.

SEO Course / Technical SEO Delivery and Site Migrations / Lesson 77

Module 14 / Lesson 77 · Read, apply, check

Use Crawl Logs to Investigate a Specific Hypothesis

Analyze a small verified crawler-log sample without confusing requests, indexing and rankings.

By Adriaan BritsCEO of Sitetrail · MSc Marketing
Former LinkedIn Learning instructor in SEO, Advanced Google Analytics and Google Ads
Course edition: October 2026

Visual explanationWorked examples35-minute practical taskKnowledge check

Ask a bounded question

Start with a hypothesis such as repeated requests to obsolete filters or missing requests to a recently moved section. Specify the host, period and URL group. A large log file is not inherently insightful until the analysis serves a decision.

Verify what the log represents

Confirm timestamp conventions, status fields, cache or proxy layers and whether the file covers the relevant host. User-agent text alone does not prove a request came from Googlebot. Use the current official verification method before reporting a crawler-specific conclusion.

Group requests meaningfully

Aggregate by useful patterns such as product pages, filter combinations, redirects and errors. Count requests separately from unique URLs. A frequently requested error can dominate totals even when it represents one destination, while a large product range may have fewer requests per URL.

Connect observations to action

A request proves a fetch attempt in that log’s scope, not indexing or ranking. Corroborate suspected problems with response tests, navigation and Search Console evidence. Choose a fix for the demonstrated failure rather than assuming every site needs a crawl-budget project.

Logs answer a request question

900 filter requests

Inspect unique URLs and the links creating repeated requests.

80 product requests

Fetch observations; not an index count.

20 server errors

Check which useful destinations and time periods are affected.

Decision

Repair evidenced obsolete paths and investigate errors separately.

Request counts become useful when connected to patterns, scope and independent checks.

See it in practice

Hypothetical example: a catalog’s verified crawler sample contains 900 requests to obsolete filter URLs, 80 requests to product URLs and 20 server errors. The analyst checks unique URLs and discovers that many filter requests repeat a small set linked from an old navigation component. She tests that component, documents the obsolete paths and proposes correcting the links. The server errors are investigated separately because they may affect useful pages. The report states the host, dates and verification method, and does not claim that 80 product requests mean 80 products are indexed. A later sample can show whether the navigation correction changes observed requests under comparable conditions.

Compare the alternative

A small local website with twenty useful pages has no evidence of crawling constraints. An agency nevertheless sells a large crawl-budget program because it found bot requests in server logs. The presence of requests is normal and does not establish that resource allocation is the business’s bottleneck. A more proportionate investigation would first inspect whether important pages are accessible, discoverable and useful, then escalate only when the evidence supports it.

Avoid this misconception

Misconception: crawl activity equals search visibility. Fetching, rendering, indexing and ranking are different processes. Logs can answer a request question within their coverage, but other evidence is needed to establish what happened afterward.

Know the boundary

Logs may contain sensitive operational or visitor information. Use approved access and aggregate only fields needed for the question. Large-site crawl management differs from routine maintenance of a small site; do not generalize the same intervention to both.

Do this today · 35 minutes

Turn this lesson into a useful action.

Analyze a small verified crawler-log sample without confusing requests, indexing and rankings.

Before you start

An approved, sanitized log sample or the synthetic counts provided here.

Practise with this scenario

Verified crawler sample: 900 obsolete-filter requests, 80 product requests, 20 server errors. Most filter requests repeat URLs linked by one old navigation component.

Your steps

  • Write the hypothesis, host, time range and crawler-verification assumption before calculating totals.
  • Separate request count from unique URL count and group rows by obsolete filter, product and error patterns.
  • Inspect the navigation component and a sample of destinations to confirm that it generates the obsolete paths.
  • Prepare a targeted link correction and a separate investigation of errors on useful pages.
  • Record which conclusions the sample supports and which still require indexing or customer-journey evidence.

What better looks like

Before: “80 crawler requests means 80 indexed products.”

After: “80 product fetch attempts in this log sample; indexing requires separate evidence.”

Your working notes

Notes stay in this browser. Download a copy to keep them.

Verify your work

  • Requests and unique URLs are distinct.
  • Crawler identity and log scope are stated.
  • The action is corroborated beyond raw counts.

Follow up

Compare an equivalent sanitized sample after the correction and check important-page access; do not infer rankings from changed request totals.

Before you move on

Make the decision.

A verified crawler-log sample shows many repeated requests to obsolete filter URLs linked by an old navigation component. It also shows eighty product requests. A report calls these eighty indexed products and recommends a site-wide rewrite. What is the strongest correction?

Sources and further reading

Google: Crawl budget

Search Console URL Inspection

Google: Crawlable links

Google: Verifying crawler requests

Lesson edition 1 · References reviewed 15 October 2026 · Practical exercise reviewed 15 October 2026. Examples are illustrative teaching scenarios.

Free learning. Informed choices.

Built for aspiring SEO directors, existing practitioners and business owners who want to turn sound judgment into practical results.

Course hub · Free skills assessment · Privacy

No Sitetrail account is required. Course progress and assessment results are saved in this browser when storage is available; they do not sync to the app. Download your worksheets and certificate to keep your own copies.

Plugin Downloaded Congratulations Installation Guide: 

  1. In WordPress, go to Plugins → Add New Plugin.
  2. Click Upload Plugin and select the downloaded ZIP file.
  3. Click Install Now, then Activate Plugin.

 

Your free trial starts automatically. No license key is needed yet.