zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/lib/libcurl/curl-7.54.1/docs/cmdline-opts/preproxy.d b/ap/lib/libcurl/curl-7.54.1/docs/cmdline-opts/preproxy.d
new file mode 100644
index 0000000..b8eb77f
--- /dev/null
+++ b/ap/lib/libcurl/curl-7.54.1/docs/cmdline-opts/preproxy.d
@@ -0,0 +1,22 @@
+Long: preproxy
+Arg: [protocol://]host[:port]
+Help: Use this proxy first
+Added: 7.52.0
+---
+Use the specified SOCKS proxy before connecting to an HTTP or HTTPS --proxy. In
+such a case curl first connects to the SOCKS proxy and then connects (through
+SOCKS) to the HTTP or HTTPS proxy. Hence pre proxy.
+
+The pre proxy string should be specified with a protocol:// prefix to specify
+alternative proxy protocols. Use socks4://, socks4a://, socks5:// or
+socks5h:// to request the specific SOCKS version to be used. No protocol
+specified will make curl default to SOCKS4.
+
+If the port number is not specified in the proxy string, it is assumed to be
+1080.
+
+User and password that might be provided in the proxy string are URL decoded
+by curl. This allows you to pass in special characters such as @ by using %40
+or pass in a colon with %3a.
+
+If this option is used several times, the last one will be used.