[squid-dev] [PATCH] squid-3.5: fix for errors when receiving a non-existent file via ftp

[Vitaly Lavrov]

Bug 4279: No response from proxy for FTP-download of non-existing file

There is no code to handle errors ftp-protocol functions ftpFail().
The patch forms a response to the client an error similar to loginFailed().
To handle specific errors, you must add code in failedHttpStatus().

If you add to the template ERR_FTP_NOT_FOUND macro "%g", then the client
will be seen the original message server (550: Permission denied/File not found)

Patch tested on squid-3.5.9
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