Sayaka617 commented on issue #3850:
URL:
https://github.com/apache/servicecomb-java-chassis/issues/3850#issuecomment-1622890525
经过分析，参考org.apache.catalina.connector.Response#setContentType
最终实际调用方法为
```java
public void setContentTypeNoCharset(String type) {
this.contentType = type;
}
```
在设置content-type时进行了特殊处理，并不会添加至header，而是设置this.contentType=contentType;
因此在org.apache.servicecomb.foundation.vertx.http.DownloadUtils#prepareDownloadHeader中获取时，应当尝试使用get方法，我将验证后提出PR修复此问题
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