Downloading HTML Instead of PDF: Find the Cause
Downloading HTML instead of PDF? Compare the request, response headers, filename and actual bytes with curl before changing your server.
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Plain-language guidance on maintaining, improving and protecting your business website.
Form Button Type: Why a Hint Submits the Form
Fix a form button type: reproduce accidental submission, set type="button", then test the hint, real submit button and keyboard locally.
Read article ↗Search Git History: When Did This Line Change?
Search Git history with -S and -G: find a string’s introduction, inspect the patch and separate code history from a bug’s cause without restoring…
Read article ↗DNS TTL: Cache Delay or an Incorrect Record?
Check DNS TTL with dig: compare authoritative servers and a resolver, inspect response statuses and distinguish cached answers from incorrect records.
Read article ↗SHA-256 Check: Did a File Change After Copying?
Compare SHA-256 checksums of two files with Python, test a mismatch, and distinguish copying integrity from backup completeness and recovery.
Read article ↗Acceptance Criteria: From Draft to Published
Acceptance criteria for publishing a news item: define roles, states, test data and observable outcomes before development starts.
Read article ↗Safe Output in PHP: Display Text, Not HTML
Safe output in PHP: test htmlspecialchars with text and a field, handle quotation marks, and understand the limits of HTML escaping.
Read article ↗.dockerignore: Keep Unwanted Files Out of Builds
Check .dockerignore with a safe Docker build context example. Exclude local configuration, keep required files and inspect the exported result.
Read article ↗NOT IN and NULL in SQL: Why Rows Disappear
NOT IN and NULL in SQL: reproduce an empty result, inspect the condition and use NOT EXISTS. Safe learning queries with expected IDs.
Read article ↗Test a Website Before a DNS Change with curl
Test a website before a DNS change with curl --resolve. Verify the new hosting IP, HTTPS and redirects without switching visitors over.
Read article ↗Fetch Error Handling: Why 404 Does Not Reach Catch
Fetch error handling: check HTTP status, JSON and button state. A practical local example with tests for 404 responses and invalid data.
Read article ↗Cron Troubleshooting: Manual vs Scheduled Runs
Cron troubleshooting without risky retries: check the working directory, PATH, interpreter and permissions with a safe shell diagnostic.
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