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https://issues.apache.org/jira/browse/HTTPCLIENT-1161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13196571#comment-13196571
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Sebb commented on HTTPCLIENT-1161:
----------------------------------

We something similar in Commons (Lang, I think) and hit some problems.

One is that the Appendable interface throws IOException; cannot remember 
off-hand what (if any) other issues were found.

It may not be as simple as replacing the parameter type.

Also, changing a parameter type is not binary compatible, so we would need to 
keep the existing method at least for now.
                
> httpclient-cache: RequestEquivalent # appendTo : make it take Appendable as 
> opposed to StringBuffer 
> ----------------------------------------------------------------------------------------------------
>
>                 Key: HTTPCLIENT-1161
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1161
>             Project: HttpComponents HttpClient
>          Issue Type: Improvement
>    Affects Versions: 4.2 Alpha1
>            Reporter: Karthik K
>            Priority: Minor
>             Fix For: 4.2 Final
>
>         Attachments: HTTPCLIENT-1161.patch
>
>
> Current signature, reads: 
> org/apache/http/impl/client/cache/RequestEquivalent.java: 
> public void appendTo(StringBuffer buf) {
> Replace the signature with Appendable, to make it more generic and not tied 
> to StringBuffer. 

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