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1. DIRECTORY STRUCTURE   traffic/ ............... top src dir   |-- ci/ ................ quality assurance and other CI tools and configs   |-- cmd/ ............... various command applications       |-- traffic_cop/ ..       |-- traffic_crashlog/       |-- traffic_ctl/ ... traffic_ctl command line management application       |-- traffic_layout/       |-- traffic_manager/       |-- traffic_top/ ... traffic_top application       |-- traffic_via/ ...       |-- traffic_wccp/ ..   |-- contrib ............ various contributed auxiliary pieces   |-- doc/ ...............       |-- admin/ ......... Admin guide documentations       |-- dot/ ........... Graphviz source files for docs pictures       |-- man/ ........... Unix style man-pages       |-- plugins/ ....... Documentation for our core plugins       |-- sdk/ ........... Plugin developer guide   |-- example/ ........... example plugins   |-- install/ ........... installation programs and scripts   |-- iocore/ ............       |-- aio/ ........... Asynchronous I/O core       |-- cache/ ......... Disk and RAM cache       |-- cluster/ ....... Cache and configuration clustering       |-- dns/ ........... DNS (asynchronous)       |-- hostdb/ ........ Internal DNS cache       |-- net/ ........... Network   |-- lib/ ...............       |-- cppapi/ ........ C++ api wrapper for plugin developers       |-- records/ ....... library for config files       |-- perl/ .......... Perl libraries for e.g. mgmt access and configurations       |-- ts/ ............ Base / core library       |-- tsconfig/....... New config parser and library (experimental)       |-- wccp/ .......... WCCP implementation   |-- m4/ ................ custom macros for configure.ac   |-- mgmt/ .............. Management server and tools (including traffic_manager)   |-- plugins/ ........... Stable core plugins       |-- experimental/ .. Experimental core plugins   |-- proxy/ ............. HTTP proxy logic　 (traffic_server的主要代码都在这里，main函数的入口在此目录下的Main.cc)       |-- api/ ........... Plugin API includes       |-- config/ ........ Configurations       |-- congest/ ....... Congestion control       |-- hdrs/ .......... Headers parsing and management       |-- http/ .......... The actual HTTP protocol implementation       |---http2/ ......... HTTP/2 implementation       |-- logging/ ....... Flexible logging   |-- README ............. intro, links, build info   |-- README-EC2 ......... info on EC2 support   |-- REVIEWERS .......... (incomplete) list of areas with committer interest   |-- LICENSE ............ full license text   `-- NOTICE ............. copyright notices

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