Spring-Cloud Zuul breaks UTF-8 symbols in forwarded multipart request filename

Question

this is first time for me on SO, so please be patient for my first question.

I think i have some kind of configuration problem, but after a day of experiments i\'m s

Answer 1

I just ran into the same issue myself, and created the following issue:

https://jira.spring.io/browse/SPR-15396

Hopefully this is getting configurable in Spring 4.3.8.

In the meantime, you have to create a bean of type FormBodyWrapperFilter (that overrides the one in ZuulConfiguration). In the constructor, you pass a copy of FormHttpMessageConverter, which extends from FormHttpMessageConverter, and you change the encoding used in FormHttpMessageConverter.MultipartHttpOutputMessage#getAsciiBytes(String) to UTF-8 (you might also want to delete any references to javax-mail, unless you have that on classpath). You need a pretty recent version of Spring Cloud Netflix to do this.

Example:

@Bean
FormBodyWrapperFilter formBodyWrapperFilter() {
    return new FormBodyWrapperFilter(new MyFormHttpMessageConverter());
}

Then you create a copy of FormHttpMessageConverter, and change the following method:

    private byte[] getAsciiBytes(String name) {
        try {
            // THIS IS THE ONLY MODIFICATION:
            return name.getBytes("UTF-8");
        } catch (UnsupportedEncodingException ex) {
            // Should not happen - US-ASCII is always supported.
            throw new IllegalStateException(ex);
        }
    }