Every Theme allows a specific size of header. Check your theme's code.
in tcp header (32 bits) we have a field that is called options and padding that has variable in length and the header length shows the actual header size i.e size of 20 octets+size of options and padding field and in UDP we dont have any field like that and its header is fixed of 8 OCTETS (32 bits header size) refrence: WIRELESS COMMUNICATIONS AND NETWORKS by William Stallings Second Edition pg 91(see fig)
A garage door header size chart provides information on the recommended size of the header beam needed to support a garage door. This chart helps determine the appropriate header size based on the width of the garage door opening and the type of construction materials used.
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The standard door header size for residential construction projects is typically 2x6 inches.
The standard garage door header size for residential homes is typically 2x12 inches.
The keyword header size chart provides information on the optimal size for headers in a document or webpage to improve search engine optimization and readability.
Header is always a multiple of 4bytes and so we can have a maximum length of the field as 15, so maximum size of the header is 60 bytes out of which 20 bytes are mandatory.
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Your GIF is most likely not moving because it is too large for Tumblr. Tumblr GIFs have to be under 500mb or else they won't move. To remedy this problem you can try resizing your GIF to a smaller size!
maximum size is 512 bytes without header
Change The Width & The Heigh To A Smaller Size Like 20, 10.
The load bearing header size chart provides information on the recommended sizes of headers needed to support different loads in a building's structure.