The Collaborative International Dictionary of English v.0.48:
Requester \Re*quest"er\ (-?r), n. One who requests; a petitioner. [1913 Webster]WordNet (r) 3.0 (2006):
requester n 1: one praying humbly for something; "a suppliant for her favors" [syn: petitioner, suppliant, supplicant, requester]