Practical fixes, setup guides and tool comparisons https://knacksupply.com/ en-US https://knacksupply.com/sendgrid-api-401-unauthorized-authorization-required-grant-invalid-n8n/ https://knacksupply.com/sendgrid-api-401-unauthorized-authorization-required-grant-invalid-n8n/ SendGrid returns different 401 messages for a missing key and a bad key, and the wording changes by endpoint. Fake-key tests and an n8n checklist. Fri, 13 Nov 2026 06:09:02 GMT https://knacksupply.com/stripe-api-401-invalid-api-key-provided-did-not-provide-api-key-n8n/ https://knacksupply.com/stripe-api-401-invalid-api-key-provided-did-not-provide-api-key-n8n/ Stripe API 401 explained with fake-key tests: "You did not provide an API key" vs "Invalid API Key provided", Basic vs Bearer, and an n8n checklist. Sat, 07 Nov 2026 09:35:13 GMT https://knacksupply.com/cloudflare-api-401-invalid-api-token-403-invalid-access-token-9109-n8n/ https://knacksupply.com/cloudflare-api-401-invalid-api-token-403-invalid-access-token-9109-n8n/ Cloudflare API 401 Invalid API Token (1000) or 403 Invalid access token (9109) for the same token? What I saw, what the docs omit, and a checklist. Fri, 06 Nov 2026 09:08:31 GMT https://knacksupply.com/slack-api-200-ok-false-not-authed-invalid-auth-n8n/ https://knacksupply.com/slack-api-200-ok-false-not-authed-invalid-auth-n8n/ Slack API returns HTTP 200 with ok false (not_authed, invalid_auth, unknown_method)? What each meant in my tests, and how to catch it in n8n. Mon, 26 Oct 2026 23:31:08 GMT https://knacksupply.com/github-api-401-bad-credentials-requires-authentication-404-not-found-403-user-agent-n8n/ https://knacksupply.com/github-api-401-bad-credentials-requires-authentication-404-not-found-403-user-agent-n8n/ GitHub API 401 Bad credentials, 401 Requires authentication, 404 Not Found or 403 User-Agent in n8n? What each meant in my tests with made-up tokens. Sun, 25 Oct 2026 03:00:03 GMT https://knacksupply.com/telegram-bot-api-401-unauthorized-404-not-found-bot-token-n8n/ https://knacksupply.com/telegram-bot-api-401-unauthorized-404-not-found-bot-token-n8n/ Telegram Bot API 401 Unauthorized vs 404 Not Found with your bot token: what each meant in ten tests with made-up tokens, plus an n8n checklist. Wed, 21 Oct 2026 02:45:03 GMT https://knacksupply.com/gemini-api-403-unregistered-callers-400-api-key-not-valid-401-oauth-n8n/ https://knacksupply.com/gemini-api-403-unregistered-callers-400-api-key-not-valid-401-oauth-n8n/ Gemini API returns 403 unregistered callers, 400 API key not valid or 401 Expected OAuth 2 access token? What each one meant when I tested it, and a checklist. Wed, 21 Oct 2026 02:33:58 GMT https://knacksupply.com/wordpress-rest-api-401-rest-forbidden-param-rest-not-logged-in/ https://knacksupply.com/wordpress-rest-api-401-rest-forbidden-param-rest-not-logged-in/ WordPress REST API returns 401 rest_forbidden_param or rest_not_logged_in with an Application Password? What I observed with curl and a short checklist. Wed, 21 Oct 2026 01:04:30 GMT https://knacksupply.com/n8n-workflow-static-data-not-saved-manual-execution/ https://knacksupply.com/n8n-workflow-static-data-not-saved-manual-execution/ n8n static data is not saved during manual or test runs, only for published workflows triggered normally. How I designed around it and what the docs recommend. Mon, 19 Oct 2026 00:27:00 GMT https://knacksupply.com/n8n-telegram-send-and-wait-approval-before-publish/ https://knacksupply.com/n8n-telegram-send-and-wait-approval-before-publish/ Use the n8n Telegram Send and Wait for Response operation to approve an action before a workflow writes anything to your site, with the settings I used. Mon, 19 Oct 2026 00:08:08 GMT https://knacksupply.com/wordpress-wp-insert-post-strips-backslashes-wp-slash/ https://knacksupply.com/wordpress-wp-insert-post-strips-backslashes-wp-slash/ wp_insert_post, wp_update_post and update_post_meta remove backslashes from your data. Here is a minimal reproduction and the wp_slash fix. Sun, 11 Oct 2026 04:54:18 GMT https://knacksupply.com/n8n-wordpress-rest-api-application-password-comments/ https://knacksupply.com/n8n-wordpress-rest-api-application-password-comments/ Set up an n8n workflow that reads, approves and answers WordPress comments through the REST API with an Application Password and a Basic Auth credential. Sat, 10 Oct 2026 07:47:15 GMT https://knacksupply.com/gemini-reply-cut-off-mid-sentence-maxoutputtokens-n8n/ https://knacksupply.com/gemini-reply-cut-off-mid-sentence-maxoutputtokens-n8n/ Gemini reply cut off mid-sentence in n8n? The response showed finishReason MAX_TOKENS because thinking tokens used most of maxOutputTokens. Here is the evidence and the fix. Thu, 08 Oct 2026 16:10:01 GMT https://knacksupply.com/gemini-api-400-unexpected-model-name-format-n8n/ https://knacksupply.com/gemini-api-400-unexpected-model-name-format-n8n/ Gemini API returns 400 INVALID_ARGUMENT with unexpected model name format in n8n? Here is what caused it in my workflow and how I fixed the model name in the URL. Thu, 08 Oct 2026 01:08:52 GMT https://knacksupply.com/n8n-vs-make-vs-zapier-self-hosting/ https://knacksupply.com/n8n-vs-make-vs-zapier-self-hosting/ n8n vs Make vs Zapier from a self-hosting view: official pricing checked in October 2026, plan limits, and what a year of self-hosted n8n looks like. Wed, 07 Oct 2026 03:17:16 GMT https://knacksupply.com/ubuntu-apt-could-not-get-lock-dpkg-lock-frontend/ https://knacksupply.com/ubuntu-apt-could-not-get-lock-dpkg-lock-frontend/ Ubuntu apt says Could not get lock /var/lib/dpkg/lock-frontend? See how I reproduced it on Ubuntu 24.04, found the process holding the lock, and fixed it safely. Wed, 07 Oct 2026 01:01:20 GMT https://knacksupply.com/n8n-webhook-404-test-url-vs-production-url/ https://knacksupply.com/n8n-webhook-404-test-url-vs-production-url/ n8n webhook returns 404? See the difference between the Test URL and Production URL, what each 404 message means, and how to fix it. Tue, 06 Oct 2026 15:37:41 GMT