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Daniel Stenberg 2002-03-19 09:08:57 +00:00
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@ -9,7 +9,7 @@ PROGRAMMING WITH LIBCURL
About this Document About this Document
This document will attempt to describe the general principle and some basic This document attempts to describe the general principles and some basic
approaches to consider when programming with libcurl. The text will focus approaches to consider when programming with libcurl. The text will focus
mainly on the C interface but might apply fairly well on other interfaces as mainly on the C interface but might apply fairly well on other interfaces as
well as they usually follow the C one pretty closely. well as they usually follow the C one pretty closely.
@ -878,7 +878,7 @@ FTP Peculiarities We Need
libcurl can either connect to the server a second time or tell the server to libcurl can either connect to the server a second time or tell the server to
connect back to it. The first option is the default and it is also what works connect back to it. The first option is the default and it is also what works
best for all the people behind firewals, NATs or ip-masquarading setups. best for all the people behind firewalls, NATs or IP-masquarading setups.
libcurl then tells the server to open up a new port and wait for a second libcurl then tells the server to open up a new port and wait for a second
connection. This is by default attempted with EPSV first, and if that doesn't connection. This is by default attempted with EPSV first, and if that doesn't
work it tries PASV instead. (EPSV is an extension to the original FTP spec work it tries PASV instead. (EPSV is an extension to the original FTP spec
@ -887,7 +887,7 @@ FTP Peculiarities We Need
You can prevent libcurl from first trying the EPSV command by setting You can prevent libcurl from first trying the EPSV command by setting
CURLOPT_FTP_USE_EPSV to FALSE. CURLOPT_FTP_USE_EPSV to FALSE.
In some cases, you will perfer to have the server connect back to you for the In some cases, you will prefer to have the server connect back to you for the
second connection. This might be when the server is perhaps behind a firewall second connection. This might be when the server is perhaps behind a firewall
or something and only allows connections on a single port. libcurl then or something and only allows connections on a single port. libcurl then
informs the remote server which IP address and port number to connect to. informs the remote server which IP address and port number to connect to.