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https://issues.apache.org/jira/browse/HTTPCLIENT-2395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18017967#comment-18017967
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Arturo Bernal commented on HTTPCLIENT-2395:
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[~aalic] I'll take a look
> Non-ASCII filename corrupted in HTTP request
> --------------------------------------------
>
> Key: HTTPCLIENT-2395
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2395
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient (classic)
> Affects Versions: 5.5
> Environment: Ubuntu 24.04
> Reporter: Ahmed
> Priority: Minor
> Labels: bug
> Fix For: 5.4.4
>
>
> Hi team,
> I recently upgraded Apache HTTP Client to newest version (5.5) from 5.3.1 and
> one of the tests in my client side service detected an issue. Issue is
> presented while forming HTTP multipart request with attachments/inlines that
> contains non-ascii characters in filename.
> Example:
>
> {code:java}
> val attachment : Part? = mimeMessage.attachments.firstOrNull()
> val multipart = MultipartEntityBuilder.create()
> multipart.setMode(HttpMultipartMode.EXTENDED)
> multipart.addBinaryBody(
> "attachments",
> attachment?.openDataStream()?.use { it.readBytes()},
> ContentType.parse(attachment?.contentType),
> attachment?.name)
> .build()
> val httpPost = HttpPost(url())
> httpPost.entity = multipart.build()
> httpClient.execute(httpPost) { it.handleResponse() }{code}
>
> From given MIME message:
>
> {code:java}
> Content-Type: multipart/alternative;
> boundary="------------705ZF0wSwOSffEDi6dR6B0hC"
> Message-ID: <[email protected]>
> From: "🌪️ R@nd0M ユーザー" <[email protected]>
> To: "Tēst 🎯 Üser" <[email protected]>
> Subject: =?UTF-8?B?Rml4IG1l?=
> --------------705ZF0wSwOSffEDi6dR6B0hC
> Content-Type: text/html
> <p> HTML </p>
> --------------705ZF0wSwOSffEDi6dR6B0hC
> Content-Type: application/octet-stream; name="ติมเงินผิดเบอร์mPayเ.xlsx"
> Content-Disposition: inline; filename="ติมเงินผิดเบอร์mPayเ.xlsx"
> Content-Transfer-Encoding: base64
> iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==
> --------------705ZF0wSwOSffEDi6dR6B0hC--
> {code}
>
> This generates HTTP request with following problematic URL encoded part:
>
> {code:java}
> Content-Disposition: form-data; name="attachments";
> filename="%F0%9F%90%99_inline-%E5%9B%BE%E5%83%8F_%E6%96%87%E4%BB%B6.png";
> filename*="UTF-8''UTF-8%27%27%25F0%259F%2590%2599_inline-%25E5%259B%25BE%25E5%2583%258F_%25E6%2596%2587%25E4%25BB%25B6.png"Content-Type:
> image/png {code}
> filename* gets UTF-8 encoded two times resulting in filename with UTF-8''
> prefix where actual value should be:
>
> {code:java}
> Content-Disposition: form-data; name="attachments";
> filename="%F0%9F%90%99_inline-%E5%9B%BE%E5%83%8F_%E6%96%87%E4%BB%B6.png";
> filename*="UTF-8''UTF-8%27%27%25F0%259F%2590%2599_inline-%25E5%259B%25BE%25E5%2583%258F_%25E6%2596%2587%25E4%25BB%25B6.png"Content-Type:
> image/png {code}
>
> I suspect that problem lies
> [here|https://github.com/apache/httpcomponents-client/blob/3eda5098f82c0d5cf1ceaa72afb1c24d9836ff56/httpclient5/src/main/java/org/apache/hc/client5/http/entity/mime/HttpRFC7578Multipart.java#L104],
> where additional UTF-8'' char is appended on filename along with original
> appending while generating multipart itself
> [here|https://github.com/apache/httpcomponents-client/blob/3eda5098f82c0d5cf1ceaa72afb1c24d9836ff56/httpclient5/src/main/java/org/apache/hc/client5/http/entity/mime/FormBodyPartBuilder.java#L164].
>
> Problem can be avoided using LEGACY mode which doesn't look as ideal solution
> to me as it doesn't support UTF-8 headers like in From or To MIME headers for
> example.
> Related JIRA: https://issues.apache.org/jira/browse/HTTPCLIENT-2360
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