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In releases prior to 1.4.2, it was possible to create an invalid URL instance s

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Good to know: In releases prior to 1.4.2, it was possible to create an invalid URL instance such as the following: new URL ("http://www.foo.com:-1/index.html").

Specifying a port number of -1 is not valid. However, in previous releases the -1 was stripped off when sending such URLS with HTTP commands. In 1.4.2, the -1 is left in the URL and this may cause problems for some HTTP servers or proxies.

Applications should not create URL instances with a -1 port number. Assuming the -1 refers to the default port in this example, the correct way to create this URL is new URL ("http://www.foo.com/index.html"). This note only applies to the single argument URL constructor.
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