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Work with If-Modified-Since and Last-Modified in ASP.Net.
3705
Work with If-Modified-Since and Last-Modified in ASP.Net.
http://www.pstruh.cz/tips/detpg_net-last-modified/
Sometimes you will need to send static files over http using ASP.Net - for example if you want to control access to the file programmatically. Such tasks can be simply handled by Response.WriteFile(FileName) for plain html files, but there are two problems:
Response.ContentType is "text/html" by default. So if you want to write .gif images by ASPX, you have to set right Content-Type http header according to the file type (image/gif).
There is a good idea to handle at least Last-Modified and If-Modified-Since headers to reduce traffic and increase performance. Otherways, the file is sent each time.
I created a simple VB.Net support functions for this tasks.
1. GetContentType - returns content-type of a file from registry
2. DateFromHTTP - converts string date from http header (Fri, 09 Sep 2005 07:51:28 GMT format) to Date format
3. DateToHTTPDate - converts date to string format. ASP.NET > Scripts and Controls > HTML Manipulation Oct 10, 2006 Antonin Foller
Response.ContentType is "text/html" by default. So if you want to write .gif images by ASPX, you have to set right Content-Type http header according to the file type (image/gif).
There is a good idea to handle at least Last-Modified and If-Modified-Since headers to reduce traffic and increase performance. Otherways, the file is sent each time.
I created a simple VB.Net support functions for this tasks.
1. GetContentType - returns content-type of a file from registry
2. DateFromHTTP - converts string date from http header (Fri, 09 Sep 2005 07:51:28 GMT format) to Date format
3. DateToHTTPDate - converts date to string format. ASP.NET > Scripts and Controls > HTML Manipulation Oct 10, 2006 Antonin Foller
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Other links at ASP.NET > Scripts and Controls > HTML Manipulation
HTML to XML conversion component. Converts any HTML document to well-formed XML to allow for the programmatic extraction of information (i.e. HTML scraping).
File-to-file HTML to XML conversion.
Memory-to-memory HTML to XML conversion.
Ability to convert character encoding during conversion process.
Flexibility in controlling how HTML entities are handled.
Automatically convert HTML entities to corresponding 8-bit characters.
Ability to drop all text formatting tags from the output.
Ability to drop/undrop specific tags from the output.
File-to-file HTML to XML conversion.
Memory-to-memory HTML to XML conversion.
Ability to convert character encoding during conversion process.
Flexibility in controlling how HTML entities are handled.
Automatically convert HTML entities to corresponding 8-bit characters.
Ability to drop all text formatting tags from the output.
Ability to drop/undrop specific tags from the output.
Category:
Sometimes you will need to send static files over http using ASP.Net - for example if you want to control access to the file programmatically. Such tasks can be simply handled by Response.WriteFile(FileName) for plain html files, but there are two problems:
Response.ContentType is "text/html" by default. So if you want to write .gif images by ASPX, you have to set right Content-Type http header according to the file type (image/gif).
There is a good idea to handle at least Last-Modified and If-Modified-Since headers to reduce traffic and increase performance. Otherways, the file is sent each time.
I created a simple VB.Net support functions for this tasks.
1. GetContentType - returns content-type of a file from registry
2. DateFromHTTP - converts string date from http header (Fri, 09 Sep 2005 07:51:28 GMT format) to Date format
3. DateToHTTPDate - converts date to string format.
Response.ContentType is "text/html" by default. So if you want to write .gif images by ASPX, you have to set right Content-Type http header according to the file type (image/gif).
There is a good idea to handle at least Last-Modified and If-Modified-Since headers to reduce traffic and increase performance. Otherways, the file is sent each time.
I created a simple VB.Net support functions for this tasks.
1. GetContentType - returns content-type of a file from registry
2. DateFromHTTP - converts string date from http header (Fri, 09 Sep 2005 07:51:28 GMT format) to Date format
3. DateToHTTPDate - converts date to string format.
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