Networking Release Notes |
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.
This has been corrected in 1.4 so that an IOException is thrown for any http error from the server and a specific exception of FileNotFoundExeption when the resource is not found (ie: 404 or 410 response codes). The exception is thrown irrespective of the file type.
Applications that assumed an exception would not be thrown when an http error is returned from the server need to be aware of this change in 1.4 - see 4160499.
Related to this issue is that HttpURLConnection.getErrorStream() method can now been used to read the error page from the http server when a http error is returned from the server. Previously getErrorStream() always returned null.
Applications that depend on toString() returning a string with the resolved hostname should be aware of this correction in 1.4 - see 4239141.
Applications that depend on behaviour where subsequent lookups always failed need to be aware of this issue - see 4256129. In addition the caching of negative lookups can be controlled by the networkaddress.cache.negative.ttl property in the java.security file.
The following lists the known issues with PortUnreachableException :-
If DHCP is used in conjunction with dynamic DNS then there are two options (i) change the name service search order in /etc/nsswitch.conf to use dns before the hosts file (ie: "hosts: dns files"), or (ii) configure InetAddress to use the DNS name service provider instead of the default provider (-Dsun.net.spi.nameservice.provider.1=dns,sun). This issue is being tracked in 4665037.
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