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https://issues.apache.org/jira/browse/HTTPCLIENT-2159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17801309#comment-17801309
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Oleg Kalnichevski commented on HTTPCLIENT-2159:
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[~michael-o] Can this issue be closed as fixed by
[https://github.com/apache/httpcomponents-core/pull/375] ?
Oleg
> Invalid handling of charset content type parameter
> --------------------------------------------------
>
> Key: HTTPCLIENT-2159
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2159
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Reporter: Michael Osipov
> Priority: Major
>
> Based on [~reschke]'s,
> [comment|https://issues.apache.org/jira/browse/HTTPCLIENT-2144?focusedCommentId=17310053&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17310053].
> We are treating several content types incorrectly. We have in
> {{org.apache.hc.core5.http.ContentType}} several content types defined which
> are per definition UTF-8 and do not contain any {{charset}} parameter or have
> another form transport encoding. Affected are:
> {code}
> public static final ContentType APPLICATION_FORM_URLENCODED = create(
> "application/x-www-form-urlencoded", StandardCharsets.ISO_8859_1);
> public static final ContentType APPLICATION_JSON = create(
> "application/json", StandardCharsets.UTF_8);
> public static final ContentType APPLICATION_NDJSON = create(
> "application/x-ndjson", StandardCharsets.UTF_8);
> public static final ContentType APPLICATION_PDF = create(
> "application/pdf", StandardCharsets.UTF_8);
> public static final ContentType APPLICATION_PROBLEM_JSON = create(
> "application/problem+json", StandardCharsets.UTF_8);
> public static final ContentType MULTIPART_FORM_DATA = create(
> "multipart/form-data", StandardCharsets.ISO_8859_1);
> public static final ContentType MULTIPART_MIXED = create(
> "multipart/mixed", StandardCharsets.ISO_8859_1);
> public static final ContentType MULTIPART_RELATED = create(
> "multipart/related", StandardCharsets.ISO_8859_1);
> public static final ContentType TEXT_HTML = create(
> "text/html", StandardCharsets.ISO_8859_1);
> public static final ContentType TEXT_EVENT_STREAM = create(
> "text/event-stream", StandardCharsets.UTF_8);
> {code}
> * {{application/x-www-form-urlencoded}}: Does not have a charset parameter:
> https://www.iana.org/assignments/media-types/application/x-www-form-urlencoded.
> HTML5 defines https://url.spec.whatwg.org/#urlencoded-serializing how to
> apply alternative encoding, but UTF-8 is standard.
> * {{application/json}}, {{application/x-ndjson}},
> {{application/problem+json}}: There is no charset definition because JSON is
> *always* UTF-8. The charset paremeter has no meaning:
> https://datatracker.ietf.org/doc/html/rfc8259#section-11
> * {{application/pdf}}: This is binary encoding, no charset
> * {{text/event-stream}}: Defined *always* as UTF-8:
> https://html.spec.whatwg.org/multipage/server-sent-events.html#server-sent-events-intro
> * {{text/html}}: https://html.spec.whatwg.org/ does not define ISO-8859-1 to
> be the default encoding. it says that encoding must be supplied by some means
> and an algorithm is applied to find it. It seems that UTF-8 is expected these
> days.
> * {{multipart/mixed}}: Does not have a charset parameter, it is up to the
> parts to supply proper encoding to perform byte-to-char conversion:
> https://datatracker.ietf.org/doc/html/rfc2046
> * {{multipart/related}}: Does not have a charset parameter, it is up to the
> parts to supply proper encoding to perform byte-to-char conversion:
> https://datatracker.ietf.org/doc/html/rfc2387
> * {{multipart/form-data}}: Does not have a charset parameter, the RFC defines
> a {{_charset_}} form field for that:
> https://datatracker.ietf.org/doc/html/rfc7578#section-4.6
> {{charset}} applies to the transport layer only and never to the semantics of
> the content-type. E.g., {{application/x-www-form-urlencoded}}.
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