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https://issues.apache.org/jira/browse/HTTPCLIENT-1983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16820590#comment-16820590
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Mateusz Mrozewski commented on HTTPCLIENT-1983:
-----------------------------------------------

This issue causes problems when calling some of the AWS services and results in 
exceptions like:
{code:java}
com.amazonaws.services.lambda.model.AWSLambdaException: The request signature 
we calculated does not match the signature you provided. Check your AWS Secret 
Access Key and signing method. Consult the service documentation for details.
{code}
Switching back to 4.5.6 resolves the problem.

> URIBuilder normalization change is significantly breaking
> ---------------------------------------------------------
>
>                 Key: HTTPCLIENT-1983
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1983
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>    Affects Versions: 4.5.7, 4.5.8
>            Reporter: Ryan Schmitt
>            Priority: Major
>             Fix For: 4.5.9
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> In 4.5.7, the behavior of URIBuilder changed in order to address 
> HTTPCLIENT-1960. Since that version was released, I have seen a concerning 
> number of users complain that this change has broken their code (see issue 
> links). In 4.5.8, as a result of HTTPCLIENT-1968, an option was added to 
> allow users to opt in to the old behavior, but the new behavior is what they 
> will get by default. This problem is difficult to work around for developers 
> who cannot exercise exact control over the runtime version of HttpClient: the 
> method they need might not be there, and if it is, it needs to be invoked 
> reflectively, or in a way that tolerates a {{NoSuchMethodError}}.
> For the sake of compatibility, I propose that we change the default value of 
> {{normalizeUri}} to {{false}}. This will be the default on the 4.5.x line 
> only; the 5.0.x line, as well as any future 4.6.x line, will normalize by 
> default (if an option is needed at all).



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