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https://issues.apache.org/jira/browse/HTTPCLIENT-2325?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oleg Kalnichevski resolved HTTPCLIENT-2325.
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Fix Version/s: 5.4-alpha3
Resolution: Fixed
> Avoid adding "; charset=" for multipart/form-data requests
> ----------------------------------------------------------
>
> Key: HTTPCLIENT-2325
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2325
> Project: HttpComponents HttpClient
> Issue Type: Improvement
> Components: HttpClient (classic)
> Affects Versions: 4.5.14
> Reporter: Vladimir Sitnikov
> Priority: Major
> Fix For: 5.4-alpha3
>
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> Currently, HttpClient adds {{; charset=}} to {{multipart/form-data}} which
> both
> 1) Breaks certain HTTP servers: see
> https://github.com/apache/jmeter/pull/6251,
> https://github.com/akka/akka-http/issues/338
> 2) Does not follow RFC 2046 and RFC 7578
> Even though including "charset" parameter is not explicitly forbidden by
> RFCs, there are known HTTP servers that can't parse such requests, so why
> generating the "charset=..." for multipart/form-data in the first place?
> See how RFC 7578 suggests setting the default charset:
> https://datatracker.ietf.org/doc/html/rfc7578#section-5.1.2
> They mention a {{_charset_}} field instead.
> ----
> Unfortunately, removal of {{multipartEntityBuilder.setCharset(charset);}} in
> the caller's code is not enough as HttpClient uses the supplied charset in
> {{HttpBrowserCompatibleMultipart}}.
> ---
> I suggest to avoid sending {{charset}} within {{multipart/form-data}} header,
> so it includes only {{boundary}} just like RFC 7578 samples.
> In other words, I suggest removing these lines:
> https://github.com/apache/httpcomponents-client/blob/54900db4653d7f207477e6ee40135b88e9bcf832/httpmime/src/main/java/org/apache/http/entity/mime/MultipartEntityBuilder.java#L215-L217
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