In Feburary 2016 28,
Get_headers() is a command in PHP that fetches HTTP headers. The get_header() function accesses the header.php file that describes the nature of the Web page or file. The get_headers function also retrieves website redirection information, error codes, authentication requirements and encryption information such as HTTP and HTTPS. The get_headers function must include the URL of the request in the argument. An argument to format the retrieved headers is optional.
cURL
Websites may have cURL enabled or use a socket connection. cURL in PHP supports FTP, HTTP, HTTPS, LDAP and other data transfer protocols. The Web connection details are contained within the cURL class. This eliminates the need to reference the connection details throughout the PHP code, decreasing the amount of time required to create cURL scripts. cURL scripts create cookies and save the cookies to specified directories. The cURL extension in PHP websites allows external websites to be accessed while remaining on the first website. This function is used for retrieving data like stock quotes from a third-party website or third-party payment vendor websites like PayPal and credit-card processors. cURL scripts are essential to creating online shopping carts and continuously updating data feeds. cURL scripts allow reporting on a connection status such as transfer speed, transferred data volume and the percentage of the file that has been downloaded so far.
Factors Affecting Get_File Speed
Get_file functions do not trigger authentication routines such as log in prompts or cookies. The file_get_contents() function also downloads files without exchanging information with the server from which it was retrieved, such as cookie processing. Using a get_file function instead of a cURL script is faster than a cURL script because these steps are skipped. Get_header speed depends on the volume of information it retrieves. Web pages with less information are retrieved more quickly. Web pages that hold less data are downloaded more quickly.
Factors Affecting cURL Speed
cURL speed depends on network latency, network speed and the speed of the server with which it is communicating. cURL scripts also depend upon the processing speed of the servers they access. cURL slows down when handling large XML files. Multi-processing allows multiple cURL tasks to run simultaneously, potentially speeding up the processing time of the whole Web page.
In Feburary 2016 28,
Showing posts with label protocols. Show all posts
Showing posts with label protocols. Show all posts
Sunday, 28 February 2016
Friday, 26 February 2016
'Disconnected From Server' in FileZillaIn Feburary 2016 26,
In Feburary 2016 26,
FileZilla can implement most of the variations of FTP, which is one of the oldest applications on the Internet. FTP's original version had few security features. To compensate for this, FTP over SSL/TLS, called FTPS and SSH FTP, called SFTP were developed. SSL is the Secure Socket Layer, which was later replaced by Transport Layer Security. These are the security features behind the HTTP Secure protocol, used by eCommerce websites to enable shoppers to enter their credit card details securely. The same security system was added to FTP to create FTP Secure. SSH is the Secure Shell that is a secure terminal emulator. SSH has its own file transfer protocol, known as Secure FTP. FileZilla is also able to transfer files according to these protocols.
Error Characteristics
The error occurs when uploading files from a PC to a server. The application completes 85 to 90 percent of the file delivery, then displays the message: “Error: Disconnected from server: ECONNABORTED - Connection aborted.” Afterward the transfer resumes, starting at 40 percent. It may again abort at the 85 to 90 percent mark and slip back to 40 percent transferred, or may complete the second time. On other occasions, the disconnected message appears in the log file, even though the file transfer continues and completes.
Cause
FTP uses two connections, one to send commands back and forth and the other for the transfer of data. FileZilla also maintains a separate connection to display the remote file directory in its own browser window. When a file is being transferred, the user often stops using the browser connection and it times out. The reported disconnect is for the browser connection, but the file transfer connections stay open because regular “keep alive” messages pass back and forth, preventing the server from closing them. The recurring transfer break at 85 percent is caused by an intermediate firewall or router dropping the control connection, which FileZilla then re-establishes.
Solution
FileZilla reports disconnection in its log file, but does not identify which connection was dropped or why. If the transfer proceeds and completes, there is little to worry about; this is a misreported or imprecise warning. Genuine dropped connections are usually caused by firewalls. You should specify FileZilla as an exception to force your firewall to accept the application's traffic. Where errors are caused by intermediate routers, there is little you can do to avoid the problem, because the router is not within your control. FileZilla, however, does work with proxy servers, so you can channel connections through a proxy to help the network server avoid a consistently troublesome router.
In Feburary 2016 26,
FileZilla can implement most of the variations of FTP, which is one of the oldest applications on the Internet. FTP's original version had few security features. To compensate for this, FTP over SSL/TLS, called FTPS and SSH FTP, called SFTP were developed. SSL is the Secure Socket Layer, which was later replaced by Transport Layer Security. These are the security features behind the HTTP Secure protocol, used by eCommerce websites to enable shoppers to enter their credit card details securely. The same security system was added to FTP to create FTP Secure. SSH is the Secure Shell that is a secure terminal emulator. SSH has its own file transfer protocol, known as Secure FTP. FileZilla is also able to transfer files according to these protocols.
Error Characteristics
The error occurs when uploading files from a PC to a server. The application completes 85 to 90 percent of the file delivery, then displays the message: “Error: Disconnected from server: ECONNABORTED - Connection aborted.” Afterward the transfer resumes, starting at 40 percent. It may again abort at the 85 to 90 percent mark and slip back to 40 percent transferred, or may complete the second time. On other occasions, the disconnected message appears in the log file, even though the file transfer continues and completes.
Cause
FTP uses two connections, one to send commands back and forth and the other for the transfer of data. FileZilla also maintains a separate connection to display the remote file directory in its own browser window. When a file is being transferred, the user often stops using the browser connection and it times out. The reported disconnect is for the browser connection, but the file transfer connections stay open because regular “keep alive” messages pass back and forth, preventing the server from closing them. The recurring transfer break at 85 percent is caused by an intermediate firewall or router dropping the control connection, which FileZilla then re-establishes.
Solution
FileZilla reports disconnection in its log file, but does not identify which connection was dropped or why. If the transfer proceeds and completes, there is little to worry about; this is a misreported or imprecise warning. Genuine dropped connections are usually caused by firewalls. You should specify FileZilla as an exception to force your firewall to accept the application's traffic. Where errors are caused by intermediate routers, there is little you can do to avoid the problem, because the router is not within your control. FileZilla, however, does work with proxy servers, so you can channel connections through a proxy to help the network server avoid a consistently troublesome router.
In Feburary 2016 26,
Thursday, 4 February 2016
How to Set Up a Router for FilezillaIn Feburary 2016 04,
In Feburary 2016 04,
Open the Filezilla FTP program. Click 'Edit' and select 'Settings.' Click on 'Connection' in the settings hierarchy and select 'Passive Mode.'
Add a check mark to 'Use Custom Port Range' and enter your desired port range. Valid ports can be from 1 to 65535, but users should assign a port range beyond 1024, as ports below that range are often reserved for other protocols.
Log in to your router's configuration page and enter the router's username and password when prompted.
Navigate to the router's 'Port Forwarding' settings page. Enter 'FileZilla' as the application name. Enter the start of the port range created in FileZilla into the 'Start' text field and the end of the port range into the 'End' text field. Set the 'TCP' and 'UDP' settings to 'Both' and add a check mark to the 'Enable' box.
Create another port forwarding entry with the same application name. Enter '20' as the start of the port range and '21' as the end of the range. Set the 'TCP' and 'UDP' settings to 'Both' and add a check mark to the 'Enable' box. Click 'Save Settings' to finalize your changes. Restart your router, if necessary. The ports assigned for FileZilla should remain open for FTP traffic.
In Feburary 2016 04,
Open the Filezilla FTP program. Click 'Edit' and select 'Settings.' Click on 'Connection' in the settings hierarchy and select 'Passive Mode.'
Add a check mark to 'Use Custom Port Range' and enter your desired port range. Valid ports can be from 1 to 65535, but users should assign a port range beyond 1024, as ports below that range are often reserved for other protocols.
Log in to your router's configuration page and enter the router's username and password when prompted.
Navigate to the router's 'Port Forwarding' settings page. Enter 'FileZilla' as the application name. Enter the start of the port range created in FileZilla into the 'Start' text field and the end of the port range into the 'End' text field. Set the 'TCP' and 'UDP' settings to 'Both' and add a check mark to the 'Enable' box.
Create another port forwarding entry with the same application name. Enter '20' as the start of the port range and '21' as the end of the range. Set the 'TCP' and 'UDP' settings to 'Both' and add a check mark to the 'Enable' box. Click 'Save Settings' to finalize your changes. Restart your router, if necessary. The ports assigned for FileZilla should remain open for FTP traffic.
In Feburary 2016 04,
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