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I keep getting a ClassFormatError exception when my webpage is loaded with HTTPS in Netscape Navigator. Why?

April 26, 2017classformaterror exception HTTPS loaded Navigator netscape webpage

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I keep getting a ClassFormatError exception when my webpage is loaded with HTTPS in Netscape Navigator. Why?

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This is caused by an applet specifying a nonexistent .jar or .class file in the EMBED tag. Due to limitation of what information can be returned via HTTPS in Navigator, the web server’s “File Not Found” HTML page is returned instead of the appropriate status. This HTML page is treated as a .class file which causes the exception.