Getting http 407 error as an IOException

Question

I'm using in my android application the HttpURLConnection through a proxy where an authentication is needed. Here is my code and I will explain you after my problem.

HttpURLConnection connection = null;
int responseCode = -1;
try {
    connection = (HttpURLConnection) myUrl.openConnection();
    connection.setInstanceFollowRedirects(false);
    connection.setConnectTimeout(DEFAULT_TIMEOUT);
    connection.setReadTimeout(DEFAULT_TIMEOUT);

    responseCode = connection.getResponseCode();
    System.out.println("ResponseCode = " + responseCode);
} catch (IOException e) {
    System.out.println("Exception : " + e.getMessage());
}

My problem is that I get an exception on the getResponseCode() method which has the following message : Failed to authenticate with proxy. Usually, this specific error has an http error code : 407. But here I just got an exception but not a response code with the 407 value.

I have the solution to apply the login and password to connect to the proxy, but I want to apply this solution only in the case there is a 407 error (and not each time I catch an exception).

Any idea will be appreciated. Thanks.

did you find solution for this one? Answer from Tonio doesn't help. — sole007
– sole007, Commented Feb 13, 2018 at 16:06

dag · Accepted Answer · 2020-06-05 06:22:10Z

Even though the question is pretty old I did not find a concrete answer so just for reference:

From my observations with Java 8, the getResponseCode in your example is the first method the actually request the server, that's why you'll get the IOException on this line.

Under the hood getInputStream is the trigger to actually establish the connection, however I would not recommend using it directly (as the implementation could change). Unfortunately calling connections.connect() does not work as expected and throws no Exception.

Finally connection.getResponseCode() also works after the exception has been thrown and this would be the key to get the response code even if the exception occured:

HttpURLConnection connection = null;
int responseCode = -1;
try {
    connection = (HttpURLConnection) myUrl.openConnection();
    connection.setInstanceFollowRedirects(false);
    connection.setConnectTimeout(DEFAULT_TIMEOUT);
    connection.setReadTimeout(DEFAULT_TIMEOUT);

    responseCode = connection.getResponseCode();
} catch (IOException e) {
    responseCode = connection.getResponseCode();
}
System.out.println("ResponseCode = " + responseCode);

Tonio · Accepted Answer · 2014-08-29 19:55:19Z

-1

Try catching HttpResponseException instead, and checking its status code (.getStatusCode()) to see if it's 407 (or better yet, HttpURLConnection.HTTP_PROXY_AUTH, more readable).

HttpResponseException is a subclass of IOException, and I think that's the actual exception that's being thrown.

(http://developer.android.com/reference/org/apache/http/client/HttpResponseException.html for more info.)

answered Aug 29, 2014 at 19:55

Tonio

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2 Comments

Tonio Over a year ago

Why the downvote? Did the proposed solution not work? Is it no longer relevant (two-year-old answer, wouldn't be surprised!)?

James Over a year ago

I didn't downvote you, but I'm guessing whoever downvoted, did so because HttpResponseException is wrong. Looking at the source code for getResponseCode(), it calls getInputStream(), which in Android's HttpConnectionImpl.java, any HTTP response code >= 400 will throw FileNotFoundException. See source: android.googlesource.com/platform/libcore/+/…

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