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https://issues.apache.org/jira/browse/HTTPCLIENT-1603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14294213#comment-14294213
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Michael Osipov commented on HTTPCLIENT-1603:
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Checked changes. That looks better now.
One facts astounds me which I and probably many others were not aware of:
bq. Please note that <interfacename>HttpClient</interfacename> implementations
re-throw <exceptionname>HttpException</exceptionname>s as
<exceptionname>ClientProtocolException</exceptionname>, which is a subclass of
<exceptionname>java.io.IOException</exceptionname>. This enables the users of
<interfacename>HttpClient</interfacename> to handle both I/O errors and
protocol violations from a single catch clause.</para>
Though, I do not see the bonus here if you use Java 7, moreover if
{{ClientProtocolException}} wraps a low-level {{HttpException}} which is not an
{{IOException}}, I do not understand why {{ClientProtocolException}} inherits
from {{IOException}}. That is confusing. Convenience, seriously?
> ClientProtocolException contradicts tutorial statement in chapter 1.4
> ---------------------------------------------------------------------
>
> Key: HTTPCLIENT-1603
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1603
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: Documentation, HttpClient
> Affects Versions: 4.3.6, 4.4 Beta1
> Reporter: Michael Osipov
> Priority: Minor
> Fix For: 4.4 Final
>
>
> [Chapter
> 1.4|http://hc.apache.org/httpcomponents-client-ga/tutorial/html/fundamentals.html#d5e271]
> says: "HttpClient can throw two types of exceptions: {{java.io.IOException}}
> in case of an I/O failure such as socket timeout or an socket reset and
> {{HttpException}} that signals an HTTP failure such as a violation of the
> HTTP protocol. Usually I/O errors are considered non-fatal and recoverable,
> whereas HTTP protocol errors are considered fatal and cannot be automatically
> recovered from."
> The
> [Javadoc|http://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/org/apache/http/client/ClientProtocolException.html]
> of {{ClientProtocolException}} says: "Signals an error in the HTTP
> protocol." Given the definition established in the tutorial, either one is
> incorrect. Either {{ClientProtocolException}} must derive from
> {{HttpException}} or its documentation must be contrary to the latter.
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