get - Request authorization of Amazon Web Service -

get - Request authorization of Amazon Web Service -

i going through doc

the next code explains construction of authorization header:

authorization = "aws" + " " + awsaccesskeyid + ":" + signature; signature = base64( hmac-sha1( yoursecretaccesskeyid, utf-8-encoding-of( stringtosign ) ) ); stringtosign = http-verb + "\n" + content-md5 + "\n" + content-type + "\n" + date + "\n" + canonicalizedamzheaders + canonicalizedresource; canonicalizedresource = [ "/" + bucket ] + <http-request-uri, protocol name query string> + [ subresource, if present. illustration "?acl", "?location", "?logging", or "?torrent"]; canonicalizedamzheaders = <described below>

and, in authentication examples (for illustration object get), have showstringtosign following:

get\n \n \n tue, 27 mar 2007 19:36:42 +0000\n /johnsmith/photos/puppy.jpg

my question:

why have used 3 \n after get ? there reason behind that?

also, can write above code follows:

get\n \n \n tue, 27 mar 2007 19:36:42 gmt\n

think of "\n" separator. illustration sending empty content-md5 , content-type, you'll see 3 \n in row.

i don't know trying please maintain in mind aws sdks can handle request signature don't have to.

amazon-web-services get