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  Tutorial: ASP Form Processing Download multiple files in one http request Tutorial

This article shows a way to download multiple files in one http request. It let's you send an HTML page along with image preview, prepare more files for download and send the files as one data stream. One request, one authentication per multiple files.

Tutorial Details:

Download multiple files in one http request

HTTP protocol was designed to send one file per one request. Sometimes you will need to send more files - usually when a client selects several files for download and the files have to be delivered to the client. I created ASP sample which will do such task - the sample is located at http://www.motobit.com/help .

The sample uses command line compression (zip/arj) to pack more files to one file and then sends the zip/arj archive to client. Client must have some software to uncompress the data package (unzip, pkunzip, winzip ...).

Zip/Arj is great for download of files. But there are some tasks which require send more files in one request, for example HTML page with many small images as a preview.

This task is usually completted as one request to HTML page and many (ten or more) requests to external images. Client-server communication for tenth of http request takes additional overhead on server, additional communication time, consumes line bandwith. The situation is even worse if you need authentication for each image preview - you must do tenth of authentication requests against user database, separated for each http request.


 

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ASP Form Processing Download multiple files in one http request Tutorial

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ASP Form Processing Download multiple files in one http request Tutorial

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