[Bug 59517] New: [Help] About Header 'Content-type'

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=59517

            Bug ID: 59517
           Summary: [Help] About Header 'Content-type'
           Product: Tomcat 8
           Version: 8.0.33
          Hardware: PC
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Catalina
          Assignee: dev@tomcat.apache.org
          Reporter: liuqiangqi...@huawei.com

Created attachment 33840
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=33840&action=edit
Response code

I use tomcat as restful server.    
I call a rest api and respone like this:
 "servletRespone.addHeader("Content-type", "application/json; charset=UTF-8");"

I wish to obtain the "Content-type" is 
        "application/json; charset=UTF-8", 
but in fact I obtain "Content-type" is 
        "application/json;charset=UTF-8".

Charset between json and less of a space.

I read the tomcat source and find this:

    public String getContentType() {

        String ret = contentType;

        if (ret != null
            && characterEncoding != null
            && charsetSet) {
            ret = ret + ";charset=" + characterEncoding;
        }

        return ret;
    }

Can you help me? 
How do I get to be able to like "application/json; charset=UTF-8".

best regards

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