Comments on: How equals() works for URLs

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By: atc

atc — Thu, 31 Dec 2009 16:18:13 +0000

Are they the same though?

The use of the subdomain (’www’) is superfluous because www is implicit when using the HTTP URL scheme; the second URL is using the implicit nature of HTTP to refer to www by default.

By: Lo Interesante del Día « Simposio Técnico

Lo Interesante del Día « Simposio Técnico — Fri, 23 Oct 2009 15:01:46 +0000

[...] equals ( http://www.javablogging.com/how-equals-works-for-urls/ ) Es un articulo interesante y a tener muy en cuenta, de hecho el dia anterior a leer este blog [...]

By: Gwenn

Gwenn — Wed, 07 Oct 2009 12:43:12 +0000

This behavior makes non-sense. Whether a Host-Header matches the same virtual server is not being decided upon the IP bound to any interface. It may be on the same machine and equal even as it differs, and it may be different even if the IP matches.

By: ppow

ppow — Tue, 06 Oct 2009 10:32:08 +0000

I believe you cannot think about internet connection in terms of URL’s ‘information used in equals comparisons’. The objects themselves were not changed by us and the equals() result changes – this is IMHO inconsistency.

Another thing: this result has nothing to do with virtual hosting (two different hosts like http://www.abc.com and http://www.xyz.com resolving to the same IP), but only with a different ways the same host name is written. So basically the note on URL.equals() means that even though http://www.abc.com and http://www.xyz.com are different hosts you can get that: (new URL(”www.abc.com”)).equals(new URL(www.xyz.com)) == true

By: Nick

Nick — Tue, 06 Oct 2009 07:01:14 +0000

Is it really inconsistent? The JavaDoc for Object.equals() states:

It [equals()] is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.

So it seems to be consistent in terms of the information used in its implementation. On the other hand, the JavaDoc for URL.equals() says:

Note: The defined behavior for equals is known to be inconsistent with virtual hosting in HTTP.

By: CertPal

CertPal — Tue, 06 Oct 2009 05:13:37 +0000

Nice ppow. Didn’t know this.

I have never used equals on a URL so far. Never found the need to. An interesting equals implementation indeed

By: Tweets that mention JavaBlogging » How equals() works for URLs -- Topsy.com

Tweets that mention JavaBlogging » How equals() works for URLs -- Topsy.com — Mon, 05 Oct 2009 11:33:59 +0000

[...] This post was mentioned on Twitter by Naresh Khalasi. Naresh Khalasi said: RT: @rahul_garg: How equals() works for URLs http://bit.ly/njWT4 [...]

By: Benjamin Winterberg

Benjamin Winterberg — Mon, 05 Oct 2009 11:04:53 +0000

Nice post.
IIRC URIs equals() is well implemented, so you should prefer URI over URL.