image_filter - постоянный 415

[Diem]

location /test/ {
	image_filter  resize 50 50;
}
в ответ всегда получаю >> 415 Unsupported Media Type
в логах >> failed (2: No such file or directory)
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nginx/0.7.57, Debian/5.0, glib/2.0.36rc1