CODEWITHSUNDEEP
javahttpurlhttpurlconnection
cjcamisa
cjcamisa

Reputation: 159

URLConnection opening weirdness

Having a tough time understanding URLConnection and where connect() is possibly being called implicitly.

This code doesn't work:

URL url = new URL(firstUrl);
HttpURLConnection connection = (HttpURLConnection) obj.openConnection();
conn.getHeaderField("Location"); //returns null
connection.setInstanceFollowRedirects(false);

This code works:

URL url = new URL(firstUrl);
HttpURLConnection connection = (HttpURLConnection) obj.openConnection();
connection.setInstanceFollowRedirects(false);
conn.getHeaderField("Location"); //returns the redirect URL

I'm having a tough time understanding this. Is the "getHeaderField" implicitly calling connect? I don't see that noted in the documentation anywhere.

Upvotes: 2

Views: 58

Answers (1)

Jonas Bergström
Jonas Bergström

Reputation: 767

It actually does connect, see http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/7-b147/sun/net/www/protocol/http/HttpURLConnection.java#HttpURLConnection.getHeaderField%28java.lang.String%29 It should be mentioned in the docs, I agree...

Upvotes: 2

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