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https://issues.apache.org/jira/browse/MYFACES-3898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14012371#comment-14012371
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Leonardo Uribe commented on MYFACES-3898:
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I don't think it is similar, because MYFACES-3402 was caused when the ajax
response was generated. In this case the compiler is adding extra xml
declarations. The code that writes the xml declaration is on
org.apache.myfaces.view.facelets.compiler.SAXCompiler.writeXmlDecl(...), but I
can't see anything wrong. We need an test case, so we can debug it more
properly.
If you have multiple templates, the trimming of the xml declaration occurs by
the presence of ui:composion or cc:interface/cc:implementation. It is something
implicit, so maybe that's the problem, you have found a valid syntax that cause
the problem, but without understand the reasons why it could occur, I'm afraid
we cannot fix it.
> Response returns multiple <?xml version='1.0' encoding='utf-8'?> headers
> ------------------------------------------------------------------------
>
> Key: MYFACES-3898
> URL: https://issues.apache.org/jira/browse/MYFACES-3898
> Project: MyFaces Core
> Issue Type: Bug
> Affects Versions: 2.2.3, 2.2.4-SNAPSHOT
> Reporter: Krashan Brahmanjara
>
> For complex pages Myfaces implemetation return response with many xml
> headers. This is not problem for Firefox but Internet Explorer sometimes cant
> render this pages and show it as plain xml
> Current Myfaces response example:
> <?xml version="1.0" encoding="UTF-8"?>
> <!DOCTYPE html>
> <?xml version="1.0" encoding="UTF-8"?>
> <?xml version="1.0" encoding="UTF-8"?>
> <?xml version="1.0" encoding="UTF-8"?>
> <?xml version="1.0" encoding="UTF-8"?>
> <?xml version="1.0" encoding="UTF-8"?>
> <?xml version="1.0" encoding="UTF-8"?>
> <?xml version="1.0" encoding="UTF-8"?>
> <?xml version="1.0" encoding="UTF-8"?>
> <?xml version="1.0" encoding="UTF-8"?>
> <?xml version="1.0" encoding="UTF-8"?>
> <?xml version="1.0" encoding="UTF-8"?>
> <html xmlns="http://www.w3.org/1999/xhtml";><head><link (...)
> This problem doesn't occurs for Mojarra implementation.
> This implementation returns response :
> ?xml version="1.0" encoding="UTF-8"?>
> <!DOCTYPE HTML>
> <html xmlns="http://www.w3.org/1999/xhtml";><head><link href=(...)
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