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REST has a parameter giving a number as ASCII digits. Next: PASV security Up: The FTP Protocol Previous: Connecting to new Ports: Dave Marshall 9/28/2001 Normally the server responds with a mark using code 150. Finally it accepts the RETR request with code 226 if the entire file was successfully written to the server's TCP buffers; rejects the RETR request with code 425 if no TCP

Servers are not required to implement REST. However, many clients can take advantage of REST to save time if a previous transfer was interrupted in the middle. The client saves the data, remembers whether there was a FIN, and closes the data connection. 3. Topics HTML CSS JS PHP Ruby Mobile UX Design Store Forums Subscribe Home Forum What's New?

The server is obliged to close the data connection in each of these cases. The start position is a nonnegative integer. If this response is anything but a mark (for example, the server can't find the file, or doesn't have permission to open it, or is temporarily out of memory, or the If the server accepts the REST request (required code 350), it has set the start position to that number.

The server may reject the RETR request without first responding with a mark. In this case the server does not touch the data connection. After sending the RETR request, reading a mark, reading data from the data connection, and closing the data connection, the client reads another response from the server. Clients beware: the file may have changed since the time of the previous transfer.

Register FAQ/Rules My SitePoint Forum Actions Mark Forums Read Quick Links View Forum Leaders Remember Me? Some servers also allow start positions for text files, with the same semantics: omit the first n bytes of data transferred through the data connection. If the server rejects the REST request, it has left the start position alone. The server might set the start position to 0 after responding to any request other than REST, so the client must send REST immediately before RETR.

However, clients cannot rely on this. The REST command -- Restart download The server keeps track of a start position for the client. The RETR parameter is an encoded pathname of the file. It then stops accepting new connections, attempts to send the contents of the file over the data connection, and closes the data connection.

The server will set the start position to 0 after a successful RETR, but might not set the start position to 0 after an unsuccessful RETR, so the client must be After sending the RETR request and reading a mark, the client reads data from the data connection until FIN (end of file), or a TCP error (for example, TCP reset or Note that code 226 from the server does not guarantee that the client has received, or will receive, the entire file. The client must check for TCP errors on the data connection.

The file is either a binary file or a text file, depending on the most recent TYPE request. Some clients do not close the data connection until they receive the 226 response from the server. At the beginning of the FTP connection, the start position is 0. The start position changes the meaning of RETR for binary files as follows: if the start position is n, the server will omit the first n bytes of the data that

The client needs to be prepared for many different ways that RETR can fail: 1. After sending the RETR request, the client reads one response from the server. Most existing servers skip a different number of bytes for text files. Otherwise the client reports temporary failure; the file has (probably) been truncated.

The client is not expected to look for a response from the server until the client sees that the data connection is closed. A REST request sets the start position. If this response is acceptance and the data connection ended with FIN, the client knows that it has received the entire file from the server. Next: PASV security Up: The FTP Protocol Previous: Connecting to new Ports: Retrieving Files: RETR and REST Commands The RETR command -- Retrieve a file A RETR request asks the server