Content-Type header missing

Warning severity, in the Response codes tab

Why it matters

Without a Content-Type, browsers and crawlers must guess how to interpret the response.

How to fix it

Send a Content-Type header, for example text/html; charset=utf-8.

How Crawlune finds it

Crawlune flags Content-Type header missing automatically on every crawl and lists the affected URLs under the Response codes tab, where you can filter, inspect each page and export the list to CSV. The free version crawls up to 550 URLs with every check enabled.