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Very often SVG makes sense, it will scale well with magnification. This idea does not deserve a separate answer so additionally I rewrote the code in a more idiomatic style:

server = SocketListen[8000
, Function[{assoc}
  , Module[
      { client = assoc["SourceSocket"], inputString, response}

    , inputString = ImportString[assoc["Data"], "HTTPRequest"] @ "Query" // Lookup["expr"]

    ; response = GenerateHTTPResponse @ ExportForm[
        ToExpression[inputString], "SVG"
      ]

    ; WriteString[client, ExportString[response, "HTTPResponse"]]

    ; Close @ client
    ]
  ]      
]

(* DeleteObject[server]
   Close[server["Socket"]]
*)