[mapserver-users] Projection values of mapfile

[Forest]

Hello everyone,
     I've been using shp2img tools to generate tile image by mapfile. And the project is by default,which is epsg:4326.Now I want to use Web Mercator Projection,Can you tell me how to write the mapfile's projection label?And Do I need to change my shpfile's projection?
    Waiting for your answers,thanks very much!
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