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Invalid method in request: method seems halfway in request-url

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http://serverfault.com – I've noticed some of these lines in my error log (apache2): Invalid method in request var1=1&var2%5B%5D=5915&var3=1GET /path/name.pdf HTTP/1.1, referer: http://www.domein.tld/path/morepath For some reason this request gets made (multiple times by different users, but the strange request is always build-up the same way). The first part of the 'request' seems to be a part of an AJAX request a certain page does (only the vars, not the URL), concatenated with a valid GET request for a file (pdf). As you can see the request does NOT start with a method (GET, POST), but does have one h (HowTos)