Update networking layer w/ CURL and emscripten impl

External/curl-8.17.0/tests/data/test137

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+<testcase>
+<info>
+<keywords>
+FTP
+RETR
+--data-binary
+</keywords>
+</info>
+# Server-side
+<reply>
+<data>
+this is file contents
+</data>
+<servercmd>
+RETRNOSIZE
+</servercmd>
+</reply>
+
+# Client-side
+<client>
+<server>
+ftp
+</server>
+<name>
+FTP download without size in RETR string
+</name>
+<command>
+ftp://%HOSTIP:%FTPPORT/blalbla/lululul/%TESTNUMBER
+</command>
+</client>
+
+# Verify data after the test has been "shot"
+<verify>
+<protocol crlf="yes">
+USER anonymous
+PASS ftp@example.com
+PWD
+CWD blalbla
+CWD lululul
+EPSV
+TYPE I
+SIZE %TESTNUMBER
+RETR %TESTNUMBER
+QUIT
+</protocol>
+</verify>
+</testcase>