| Name | Package | Description |
| AuthChallengeException | org.apache.commons.httpclient.auth | Signals a failure processing authentication challenge |
| AuthenticationException | org.apache.commons.httpclient.auth | Signals a failure in authentication process |
| CircularRedirectException | org.apache.commons.httpclient | Signals a circular redirect |
| ConnectionPoolTimeoutException | org.apache.commons.httpclient | A timeout while connecting waiting for an available connection
from an HttpConnectionManager. |
| ConnectTimeoutException | org.apache.commons.httpclient | A timeout while connecting to an HTTP server or waiting for an
available connection from an HttpConnectionManager. |
| CredentialsNotAvailableException | org.apache.commons.httpclient.auth | Authentication credentials required to respond to a authentication
challenge are not available |
| DateParseException | org.apache.commons.httpclient.util | An exception to indicate an error parsing a date string. |
| HttpException | org.apache.commons.httpclient | Signals that an HTTP or HttpClient exception has occurred. |
| HttpRecoverableException | org.apache.commons.httpclient |
Signals that an HTTP or HttpClient exception has occurred. |
| InvalidCredentialsException | org.apache.commons.httpclient.auth | Authentication credentials required to respond to a authentication
challenge are invalid |
| MalformedChallengeException | org.apache.commons.httpclient.auth | Signals that authentication challenge is in some way invalid or
illegal in the given context |
| MalformedCookieException | org.apache.commons.httpclient.cookie | Signals that a cookie is in some way invalid or illegal in a given
context |
| NoHttpResponseException | org.apache.commons.httpclient |
Signals that the target server failed to respond with a valid HTTP response. |
| ProtocolException | org.apache.commons.httpclient | Signals that an HTTP protocol violation has occurred. |
| ProxyDetectionException | org.apache.commons.httpclient.contrib.proxy | Signals a problem with auto-detecting the proxy information using the java
plugin. |
| RedirectException | org.apache.commons.httpclient | Signals violation of HTTP specification caused by an invalid redirect |
| TimeoutController.TimeoutException | org.apache.commons.httpclient.util | Signals that the task timed out. |
| URI.DefaultCharsetChanged | org.apache.commons.httpclient | The charset-changed normal operation to represent to be required to
alert to user the fact the default charset is changed. |
| URIException | org.apache.commons.httpclient | The URI parsing and escape encoding exception. |