Non English characters are not working when content type if multipart/form-data;

[helloalbin]

The following code with Non English character works fine with json content type

Map<String, Object> body = (Map) exchange.getAttachment(BodyHandler.REQUEST_BODY);

However if the content type is multipart/form-data, it gives a garbage value.

[stevehu]

If you didn't change the default character set on the server, it should be UTF-8, which is the standard on the Internet. All browsers will use UTF-8 unless you change the configuration on the browser. We have customers in Canada, and they have to support both English and French for all form inputs, and I haven't received any issues unless they misconfigured charset. Could you please provide a detailed example the issue can be replicated? Thanks.

[helloalbin]

I will share a repo with the example.

[helloalbin]

This is the code that I am using today to make it working now.

Map<String, Object> body = new HashMap<>();
		exchange.startBlocking(); // Enable blocking mode
		try (FormDataParser parser = FormParserFactory.builder().build().createParser(exchange)) {
			if (parser != null) {
				FormData formData = parser.parseBlocking();
				for (String field : formData) {
					for (FormData.FormValue formValue : formData.get(field)) {
						if (formValue.isFileItem()) {
  							InputStream stream = formValue.getFileItem().getInputStream();
  							FormData.FileItem file = new FormData.FileItem(stream.readAllBytes());
  							body.put(field, file);
  						} else {
  							String isoValue = formValue.getValue();
  							String utfValue = new String(isoValue.getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8);// Value retrieved in ISO-8859-1
  
  							body.put(field, utfValue);
  						}
					}
				}
			}
		}

[KalevGonvick]

This is the code that I am using today to make it working now.

Map<String, Object> body = new HashMap<>();
		exchange.startBlocking(); // Enable blocking mode
		try (FormDataParser parser = FormParserFactory.builder().build().createParser(exchange)) {
			if (parser != null) {
				FormData formData = parser.parseBlocking();
				for (String field : formData) {
					for (FormData.FormValue formValue : formData.get(field)) {
						if (formValue.isFileItem()) {
  							InputStream stream = formValue.getFileItem().getInputStream();
  							FormData.FileItem file = new FormData.FileItem(stream.readAllBytes());
  							body.put(field, file);
  						} else {
  							String isoValue = formValue.getValue();
  							String utfValue = new String(isoValue.getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8);// Value retrieved in ISO-8859-1
  
  							body.put(field, utfValue);
  						}
					}
				}
			}
		}

If this happens when parsing FormData, we should make sure that the BodyHandler does encounter the same issue. If it does, we can look into externalizing a configuration to retrieve the data using different charsets (the default being UTF-8).