$_SERVER is a PHP super global variable which holds information about headers, paths, and script locations.
Sometimes they are. Headers and footers are used to convey information. If you write a contract or proposal, you probably want page numbers on each page, so you can identify where to find information. Headers and footers are not exclusive to academic writing.
labeling all files, removable media and subject headers
Headers and trailers are additional data added to the beginning and end of a message or packet. Headers contain information about the message or packet, such as sender, receiver, and data size, while trailers provide error detection or correction information. Headers and trailers are typically added and removed at the network or transport layer of the OSI model by network protocols such as TCP/IP.
Payload is the actual data which is being transmitted (as opposed to the headers and routing information).
Row headers are cells containing a name for (or a description of) the information to be found in that row; they are usually placed in the leftmost column of the spreadsheet.
Borla headers are by far the best aftermarket headers available for performance cars and trucks.
authentication headers authentication headers
Stateless Packet Filters
all engines have exhaust headers but the headers your thinking of are aftermarket performance headers, the ones on the 440 from the factory are made of cast iron.
Proper headers will weigh between 12 pounds to 35 pounds for a small set of V8 headers
what kind of headers do i use when installling a 72 olds 350 rocket into a 85 olds cutlas supreme ? long tube or short tube headers
Not sure what you mean by "new" headers. You probably mean the C++ standard library headers, however these headers have been in existence since before 1998 when the language first became standardised. Prior to that, C++ used the C standard library headers, all of which have a .h extension. The C++ standard library headers have no file extension.