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https://issues.apache.org/jira/browse/HTTPCLIENT-2200?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oleg Kalnichevski resolved HTTPCLIENT-2200.
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Fix Version/s: 5.2-alpha2
Resolution: Fixed
> Protocol interceptors are executed before the connection route has been fully
> established
> -----------------------------------------------------------------------------------------
>
> Key: HTTPCLIENT-2200
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2200
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient (async)
> Affects Versions: 5.1.2, 5.2-alpha1
> Reporter: Andrei Vasilev
> Priority: Major
> Fix For: 5.2-alpha2
>
>
> Currently, a user is able to add HttpRequestInterceptor when building a new
> client using HttpAsyncClientBuilder. However, when executing a request, these
> interceptors are called at point when the final application protocol has not
> been established yet. The protocol returned by httpcontext is always
> http/1.1, the protocol of the initial CONNECT request. Since the interceptors
> do not have access to the final protocol, then the user must commit to an
> application protocol pre-emptively when constructing their request in terms
> of header capitalization, including the Host/Connection header or not, how
> cookies are appended, etc. This is clearly problematic since it cannot be
> known pre-emptively what protocol the server on the other end will end up
> choosing when a connection is established.
> On line 925 of HttpAsyncClientBuilder, I can see that a DefaultHttpProcessor
> is provided to the IOEventHandlerFactory, which contains
> HttpRequestInterceptors that DO have access to the final application protocol
> information, because they are called at a later point in time when this
> information has been fully established. I see that if the protocol was
> assumed by the user to be H2, but the final connection ends up using 1.1,
> then a Host and Connection header are added to the request if they are
> missing. However, the opposite is not provided. That is, if the protocol is
> assumed to be 1.1 and the Host / Connection headers are included by the user,
> but the connection upgrades to H2, it results in an illegal request due to
> invalid headers.
> To solve this issue, it would be nice if a user was able to add additional
> interceptors to the DefaultHttpProcessor on line 925, so that they too are
> able to have access to protocol information and potentially augment their
> request where needed.
> https://github.com/apache/httpcomponents-client/blob/master/httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/HttpAsyncClientBuilder.java
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