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ESL Documentation

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Q6. What protocols does the ESL WEB access library support?

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The WEB access facility provides 3 of the standard Internet protocols:

HTTP – standard access to WEB pages

HTTPS – access to WEB pages using the Secure Socket Layer, which provides robust point-to-point security for the information being exchanged with the Server

FTP – a file transfer facility

All 3 protocols allow both binary and character data to be exchanged between the ESL Application and the Server. However, as the HTTP and HTTPS protocols use an ESL string structure as a buffer, it is not currently possible to write the binary data to a file. If binary data (data such as images) needs to be downloaded and saved, then we recommend using the FTP facility, since this process writes the transmission directly to a file.