Update networking layer w/ CURL and emscripten impl

External/curl-8.17.0/tests/data/test2004

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+<testcase>
+<info>
+<keywords>
+TFTP
+TFTP RRQ
+FILE
+SFTP
+SCP
+multiprotocol
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<data nocheck="yes">
+Test data file
+for tftp test
+</data>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+tftp
+sftp
+</server>
+<name>
+TFTP RRQ, SFTP, FILE, SCP retrieval then in rev order
+</name>
+<command option="no-include">
+--key %LOGDIR/server/curl_client_key --pubkey %LOGDIR/server/curl_client_key.pub -u %USER: tftp://%HOSTIP:%TFTPPORT//%TESTNUMBER sftp://%HOSTIP:%SSHPORT%SFTP_PWD/%LOGDIR/test%TESTNUMBER.txt file://localhost%FILE_PWD/%LOGDIR/test%TESTNUMBER.txt scp://%HOSTIP:%SSHPORT%SCP_PWD/%LOGDIR/test%TESTNUMBER.txt file://localhost%FILE_PWD/%LOGDIR/test%TESTNUMBER.txt sftp://%HOSTIP:%SSHPORT%SFTP_PWD/%LOGDIR/test%TESTNUMBER.txt tftp://%HOSTIP:%TFTPPORT//%TESTNUMBER --insecure
+</command>
+<file name="%LOGDIR/test%TESTNUMBER.txt">
+This is test data
+for several protocols
+</file>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^timeout = [5-6]$
+</strip>
+<protocol>
+opcode = 1
+mode = octet
+tsize = 0
+blksize = 512
+filename = /%TESTNUMBER
+opcode = 1
+mode = octet
+tsize = 0
+blksize = 512
+filename = /%TESTNUMBER
+</protocol>
+<stdout>
+Test data file
+for tftp test
+This is test data
+for several protocols
+This is test data
+for several protocols
+This is test data
+for several protocols
+This is test data
+for several protocols
+This is test data
+for several protocols
+Test data file
+for tftp test
+</stdout>
+</verify>
+</testcase>