duplicate headers received from server using Struts2

Question

I am using Struts2 in an application. I need to download excel file(.xlsx and .xls formats). This is working properly in IE but in Chrome it is showing error

"Duplicate headers received from server"

I use quotes before the file name("<File Name"). Still it is not working in chrome. Below is the code snippets used in my application.

struts.xml

<action name="*Excel" method="{1}" class="ReportUtilityAction">
    <result name="success" type="stream">
        <param name="contentType">application/vnd.ms-excel</param>
        <param name="inputName">fileInputStream</param>
        <param name="bufferSize">1024</param>
    </result>
</action>

I have mentioned the content-disposition in the action class as

static final private String Content = "Content-Disposition";

HttpServletResponse response = this.getHttpResponse();
response.setHeader(Content, "attachment;filename='Export.xlsx';");

If you are using `stream` result then use it to set content disposition header also. — Aleksandr M, Jan 08 '15 at 09:11
@AleksandrM I have used the content disposition through action class. is that what you have asked me to try? I am not able to get you. Could you explain in detail? — Anju, Jan 08 '15 at 09:25
`stream` result already sets this header and you are adding another one hence this error. Read docs about `stream` result. — Aleksandr M, Jan 08 '15 at 09:42

score 1 · Accepted Answer · answered Jan 08 '15 at 09:36

1

You can set contentDisposition in the same way you've set the other headers: in struts configuration.

<result name="success" type="stream">
    <param name="contentDisposition">attachment;filename="Export.xlsx";</param>
    <param name="contentType">application/vnd.ms-excel</param>
    <param name="inputName">fileInputStream</param>
    <param name="bufferSize">1024</param>
</result>

You can also have it parameterized by using the ${} notation, with a corresponding getter in the Action:

<param name="contentDisposition">attachment;filename="${filename}";</param>

public String getFilename(){ ... }

answered Jan 08 '15 at 09:36

Andrea Ligios

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I tried this. still i am getting the same error in chrome – Anju Jan 08 '15 at 10:53
You obviously need to remove the `response.setHeader(Content, "attachment;filename='Export.xlsx';");` part from your action – Andrea Ligios Jan 08 '15 at 11:37
Ensure you've redeployed correctly and nothing is cached – Andrea Ligios Jan 08 '15 at 13:07
Thank you Andrea. Once i cleared my cache it worked as expected. – Anju Jan 09 '15 at 09:27

score 0 · Answer 2 · answered Jan 08 '15 at 11:13

0

The error means that the header field is set twice; you should be able to see that in an HTTP trace. Thus you need to find out why it's set twice.

answered Jan 08 '15 at 11:13

Julian Reschke

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duplicate headers received from server using Struts2

2 Answers2

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