Apache (on both Linux and Windows) is happy to accept each of the following: 
Content-type: text/html
Content-Type: text/html
CoNtEnT-TyPe: text/html

[download]
The original poster does not mention which server is being used. I can't find a definitive word on capitalization on HTTP headers but the HTTP docs I can lay my hands on seem rather casual about capitalization. YMMV

In reply to Re: Re: Re: What could prompt an i.s.e.? by dvergin
in thread What could prompt an internal server error? by Anonymous Monk

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