Is Proxy Authenticated or not in Applet

Question

<p>
Hi Everyone,
</p>
<p>
I need to show proxy details to the user in an applet and I got the proxy host and port by using the JDK API and I need to check is the proxy is authenticated or not and I used the below code in the applet
</p>
<p>
public boolean checkHttpAuthentication() {
</p>
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logger.info("Start of detecting proxy authentication settings");
HttpURLConnection urlConnection = null;
</p>
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try {
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String host = SiteSurveyAppletConstants.HTTP_PROXY_DETECT_URL;
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URL url = new URL(host);
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urlConnection = (HttpURLConnection) url.openConnection();
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urlConnection.setDoInput(true);
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urlConnection.setDoOutput(true);
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urlConnection.setUseCaches(false);
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int statusCode = urlConnection.getResponseCode();
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logger.info("statusCode : " + statusCode);
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if(statusCode == HTTPStatusCodes.SC_PROXY_AUTHENTICATION_REQUIRED) {
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isProxyAuthenticated = true;
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</p>
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} catch (Exception e) {
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System.out.print("Error occured while sending data to the server\n" + e);
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<p>
</p>
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logger.info("End of detecting proxy authentication settings");
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return isProxyAuthenticated;
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</p>
<p>
When I access the applet a dialog box (Firefox browser dialog box) is prompting to enter the user credential and applet is loaded into the browser after entering the user credentials, but if you see the code in above snippet, it's not returning me the 407 status code, it's returning me the 200.
</p>
<p>
In my application applet will first fetch the proxy settings and will do some processing (connecting to the server) and will load into the browser. So for connecting to the server I need to know whether the proxy is authenticated or not. If it is authenticated then I need to open a dialog box asking the user to enter the credentials and will use those credentials for connecting back to the server
</p>
<p>
Can anyone help me what is causing the problem
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<p>
Thanks
</p>

Answer 1

Hi,
MINUS does two full table scans & removes matches after whereas NOT IN does a full table scan of table 1 then for each row it searches through table two...assuming you have two proper tables e.g.:
TABLE1: 20,000 rows in 1000 blocks
TABLE2: 10,000 rows in 500 blocks
Reads required for minus:
Full scan of TABLE1 = 1000 blocks
+
Full scan of Table2 = 500 blocks
= 1500 reads
Reads required for NOT IN:
Full scan of TABLE1 = 1000 blocks
20,000 lookups in TABLE2 = 20,000 x (depth of index on TABLE2)
= 21,000 at least
So a lot more work is done with NOT IN. Taken from here. Note the gets:
SQL> select count(*) from
  2  ( select object_id from t1
  3    minus
  4    select object_id from t2
  5  )
  6  /
  COUNT(*)
       171
Statistics
          0  recursive calls
         24  db block gets
        136  consistent gets
         64  physical reads
          0  redo size
        380  bytes sent via SQL*Net to client
        518  bytes received via SQL*Net from client
          4  SQL*Net roundtrips to/from client
          3  sorts (memory)
          0  sorts (disk)
          1  rows processed
SQL> select count(*) from
  2  ( select object_id from t1
  3    where object_id not in
  4    ( select object_id from t2
  5    )
  6  )
  7  /
  COUNT(*)
       171
Statistics
          0  recursive calls
         12  db block gets
      84406  consistent gets
          0  physical reads
          0  redo size
        405  bytes sent via SQL*Net to client
        541  bytes received via SQL*Net from client
          4  SQL*Net roundtrips to/from client
          1  sorts (memory)
          0  sorts (disk)
          1  rows processedMike