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.NET Forum / ASP.NET / General / October 2007Question about IMG tags and file names
Do browsers determine the type of a file by either looking at it's contents or it's file name when parsing an IMG tag? IE7 can be asked to display "Photo.tmp" which is actually a JPG and it displays it correct. Just worried that other browsers may to it a different way. The reason it's called TMP is that the file is coming out of a SQL IMAGE field and I don't have the original file name to hand. Cheers< Rob. Are you saying you are saving the image in a file? This is unnecessary. The standard way of serving database images is making a special page GetImage.aspx that will get images from the database and stream them down top the client in the http response. The image url will look like "GetImage.aspx?id=xxx"/  SignatureEliyahu Goldin, Software Developer Microsoft MVP [ASP.NET] http://msmvps.com/blogs/egoldin http://usableasp.net > Do browsers determine the type of a file by either looking at it's > contents or it's file name when parsing an IMG tag? IE7 can be asked to [quoted text clipped - 6 lines] > > Cheers< Rob. > Are you saying you are saving the image in a file? This is unnecessary. > The The image is saved in a database. Imagine a gallery of photos like on facebook. The application extracts the image from the database, writes it into a file and then generates IMG tags to point to the download files. It has to work this way - the generated pages are static, only updated periodically. So an IMG tag has to be used - the question is how to, with an IMG tag, does the browser work out what type of file it is? Does it a) look and the extension or b) look at the file header. And if (b) is that true for all browsers? Cheers, Rob. > The image is saved in a database. Imagine a gallery of photos like on > facebook. The application extracts the image from the database, writes it > into a file and then generates IMG tags to point to the download files. > > It has to work this way - the generated pages are static, only updated > periodically. Still the standard solution looks better to me. There is absolutely no advantages in using files. You have to take care of deleting them, of file naming, of scalability. > So an IMG tag has to be used - the question is how to, with an IMG tag, > does the browser work out what type of file it is? Does it a) look and the > extension or b) look at the file header. b) > And if (b) is that true for all browsers? To be 100% sure, you need to investigate about every browser separately. For Mozilla this source http://developer.mozilla.org/en/docs/How_Mozilla_determines_MIME_Types says: ...for images loaded via <img src>, Mozilla's image library will do content sniffing (never extension sniffing) to find out the real type of the image. Look also in this: HTTP content-type and browser support http://www.byteflex.co.uk/http_content_type_and_browser_support.html SignatureEliyahu Goldin, Software Developer Microsoft MVP [ASP.NET] http://msmvps.com/blogs/egoldin http://usableasp.net > Cheers, Rob. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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