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In page Application server:
"Mobile application servers, Application servers, and web servers serve similar purposes: they are pieces of middleware that connect back-end systems to the users that need to access them, but the technology in each of the three differs. Application servers—developed before the ubiquity of web-based applications—expose back-end business logic through various protocols, sometimes including HTTP, and manage security, transaction processing, resource pooling, and messaging.[1] When web-based applications grew in popularity, application servers did not meet the needs of developers, and the web server was created to fill the gap.
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