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'content-type' => 'image+bitmap/jpeg',
'content-Disposition' => 'inline; filename=xxx; ' . str_repeat( 'o', 1024 ),
'content-duration' => 35.6363,
'content-custom' => 'hello',
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'content-type' => 'image+bitmap/jpeg',
'content-Disposition' => 'inline; filename=xxx; ' . str_repeat( 'o', 1024 ),
'content-duration' => 35.6363,
'content-custom' => 'hello',
'x-content-custom' => 'hello'