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<TITLE>Getting the Response Headers from an HTTP Connection
(Java Developers Almanac Example)
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<h3>
e140.
Getting the Response Headers from an HTTP Connection</h3>
<pre>
try {
// Create a URLConnection object for a URL
URL url = new URL(<font color="#0066ff"><i>"http://hostname:80"</i></font>);
URLConnection conn = url.openConnection();
// List all the response headers from the server.
// Note: The first call to getHeaderFieldKey() will implicit send
// the HTTP request to the server.
for (int i=0; ; i++) {
String headerName = conn.getHeaderFieldKey(i);
String headerValue = conn.getHeaderField(i);
if (headerName == null && headerValue == null) {
// No more headers
break;
}
if (headerName == null) {
// The header value contains the server's HTTP version
}
}
} catch (Exception e) {
}
</pre>
Here's a sample of headers from a website:
<pre>
Key=Value
null=HTTP/1.1 200 OK
Server=Netscape-Enterprise/4.1
Date=Mon, 11 Feb 2002 09:23:26 GMT
Cache-control=public
Content-type=text/html
Etag="9fa67d2a-58-71-3bbdad3283"
Last-modified=Fri, 05 Oct 2001 12:53:06 GMT
Content-length=115
Accept-ranges=bytes
Connection=close
</pre>
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Related Examples
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e141. <a class="eglink" href="GetCookies.html?l=rel">
Getting the Cookies from an HTTP Connection
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e142. <a class="eglink" href="SendCookie.html?l=rel">
Sending a Cookie to an HTTP Server
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e143. <a class="eglink" href="NoRedirect.html?l=rel">
Preventing Automatic Redirects in a HTTP Connection
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See also:
<a class="eglink" href="/egs/java.net/pkg.html?l=rel#Datagram">
Datagram
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<a class="eglink" href="/egs/java.net/pkg.html?l=rel#Encodings">
Encodings
</a>
<a class="eglink" href="/egs/java.net/pkg.html?l=rel#Hostnames%20and%20IP%20Addresses">
Hostnames and IP Addresses
</a>
<a class="eglink" href="/egs/java.net/pkg.html?l=rel#Multicast">
Multicast
</a>
<a class="eglink" href="/egs/java.net/pkg.html?l=rel#Sockets">
Sockets
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<a class="eglink" href="/egs/java.net/pkg.html?l=rel#URLs">
URLs
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