<h2>org.das2.util.filesystem.HttpUtil</h2><p>Utilities for HTTP protocol, such as a cache for the HEAD metadata.</p>
<h2>HttpUtil( )</h2>
<p></p>

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<a name="checkRedirect"></a>
<h2>checkRedirect</h2>
checkRedirect( <a href='https://docs.oracle.com/javase/8/docs/api/java/net/URLConnection.html'>java.net.URLConnection</a> urlConnection ) &rarr; <a href='https://docs.oracle.com/javase/8/docs/api/java/net/URLConnection.html'>java.net.URLConnection</a>

<p>check for 301, 302 or 303 redirects, and return a new connection in this case.
 This should be called immediately before the urlConnection.connect call,
 as this must connect to get the response code.</p>

<h3>Parameters</h3>
urlConnection - if an HttpUrlConnection, check for 301 or 302; return connection otherwise.

<h3>Returns:</h3>
a connection, typically the same one as passed in.
<br><br>
<a href="https://github.com/autoplot/dev/search?q=checkRedirect&unscoped_q=checkRedirect">[search for examples]</a>
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 <a href="http://www-pw.physics.uiowa.edu/~jbf/autoplot/javadoc2018/org/das2/util/filesystem/HttpUtil.html#checkRedirect">[view on old javadoc]</a>
 <a href="https://saturn.physics.uiowa.edu/svn/das2/dasCore/community/autoplot2011/trunk/dasCoreUtil/src/org/das2/util/filesystem/HttpUtil.java">[view source]</a>
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<a name="consumeStream"></a>
<h2>consumeStream</h2>
consumeStream( <a href='https://docs.oracle.com/javase/8/docs/api/java/io/InputStream.html'>java.io.InputStream</a> err ) &rarr; void

<p>nice clients consume both the stderr and stdout coming from websites.
 This reads everything off of the stream and closes it.
 http://docs.oracle.com/javase/1.5.0/docs/guide/net/http-keepalive.html 
 suggests that you "do not abandon connection"</p>

<h3>Parameters</h3>
err - the input stream

<h3>Returns:</h3>
void (returns nothing)

<br><br>
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 <a href="http://www-pw.physics.uiowa.edu/~jbf/autoplot/javadoc2018/org/das2/util/filesystem/HttpUtil.html#consumeStream">[view on old javadoc]</a>
 <a href="https://saturn.physics.uiowa.edu/svn/das2/dasCore/community/autoplot2011/trunk/dasCoreUtil/src/org/das2/util/filesystem/HttpUtil.java">[view source]</a>
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<a name="copyConnectProperties"></a>
<h2>copyConnectProperties</h2>
copyConnectProperties( <a href='https://docs.oracle.com/javase/8/docs/api/java/net/HttpURLConnection.html'>java.net.HttpURLConnection</a> urlc, <a href='https://docs.oracle.com/javase/8/docs/api/java/net/HttpURLConnection.html'>java.net.HttpURLConnection</a> newConnection ) &rarr; void

<p>copy over connection properties like Cookie and Accept-Encoding.</p>

<h3>Parameters</h3>
urlc - a HttpURLConnection
<br>
newConnection - a HttpURLConnection

<h3>Returns:</h3>
void (returns nothing)

<br><br>
<a href="https://github.com/autoplot/dev/search?q=copyConnectProperties&unscoped_q=copyConnectProperties">[search for examples]</a>
 <a href="https://github.com/autoplot/documentation/tree/master/javadoc/org/das2/util/filesystem/HttpUtil.md">[view on GitHub]</a>
 <a href="http://www-pw.physics.uiowa.edu/~jbf/autoplot/javadoc2018/org/das2/util/filesystem/HttpUtil.html#copyConnectProperties">[view on old javadoc]</a>
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<a name="getMetadata"></a>
<h2>getMetadata</h2>
getMetadata( <a href='https://docs.oracle.com/javase/8/docs/api/java/net/URL.html'>java.net.URL</a> url, <a href='https://docs.oracle.com/javase/8/docs/api/java/util/Map.html'>java.util.Map</a> props ) &rarr; <a href='https://docs.oracle.com/javase/8/docs/api/java/util/Map.html'>java.util.Map</a>

<p>return the metadata about a URL.  This will support http, https,
 and ftp, and will check for redirects.  This will
 allow caching of head requests.</p>

<h3>Parameters</h3>
url - ftp,https, or http URL
<br>
props - if non-null, may be a map containing cookie.

<h3>Returns:</h3>
the metadata
<h3>See Also:</h3>
<a href='null'>WebProtocol#META_EXIST</a> <br>
<a href='null'>WebProtocol#HTTP_RESPONSE_CODE</a> <br>
<br><br>
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 <a href="http://www-pw.physics.uiowa.edu/~jbf/autoplot/javadoc2018/org/das2/util/filesystem/HttpUtil.html#getMetadata">[view on old javadoc]</a>
 <a href="https://saturn.physics.uiowa.edu/svn/das2/dasCore/community/autoplot2011/trunk/dasCoreUtil/src/org/das2/util/filesystem/HttpUtil.java">[view source]</a>
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