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https://issues.apache.org/jira/browse/CAMEL-22353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18016219#comment-18016219
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Claus Ibsen commented on CAMEL-22353:
-------------------------------------
Do you have a use-case where you have headers with invalid names and what name
was that
> Undertow "null header error" on response if there is an invalid character in
> the request header name
> ----------------------------------------------------------------------------------------------------
>
> Key: CAMEL-22353
> URL: https://issues.apache.org/jira/browse/CAMEL-22353
> Project: Camel
> Issue Type: Improvement
> Components: camel-undertow
> Affects Versions: 4.13.0
> Reporter: Valeriy Ak
> Priority: Minor
> Labels: Undertow
> Fix For: 4.x
>
>
> I understand that this is not exactly a Camel component bug, but more of a
> compatibility issue. However, it seems like it would be nice to support this
> compatibility.
> In [Undertow|https://github.com/undertow-io/undertow], when forming a
> response, there is a built-in check for characters ([only codes 0–255 are
> allowed|https://github.com/undertow-io/undertow/blame/0ea9ca3f1b79389daea2d46aaa33977d5154be15/core/src/main/java/io/undertow/util/HttpString.java#L159])
> . If an invalid character appears in a header name, then the name becomes
> {{null}} and an exception is thrown.
> When responding, {{HttpHeaderFilterStrategy}} checks the header name for
> {{{}null{}}}, but does not check for RFC validity
> ([link|https://www.rfc-editor.org/rfc/rfc7230#section-3.2.4]).
> It would be great to add a mode for validating header correctness on input,
> or perhaps suports Undertow logic for response.
>
> {code:java}
> java.lang.NullPointerException: UT010052: Header name was nul
> at
> io.undertow.servlet.spec.HttpServletResponseImpl.addHeader(HttpServletResponseImpl.java:271)
> ~[undertow-servlet-2.3.18.Final.jar:2.3.18.Final]
> at
> io.undertow.servlet.spec.HttpServletResponseImpl.addHeader(HttpServletResponseImpl.java:266)
> ~[undertow-servlet-2.3.18.Final.jar:2.3.18.Final]
> at
> org.apache.camel.http.common.DefaultHttpBinding.doWriteResponse(DefaultHttpBinding.java:443)
> ~[camel-http-common-4.13.0.jar:4.13.0]
> at
> org.apache.camel.http.common.DefaultHttpBinding.writeResponse(DefaultHttpBinding.java:373)
> ~[camel-http-common-4.13.0.jar:4.13.0]
> at
> org.apache.camel.http.common.CamelServlet.afterProcess(CamelServlet.java:380)
> ~[camel-http-common-4.13.0.jar:4.13.0]
> at org.apache.camel.http.common.CamelServlet.doExecute(CamelServlet.java:321)
> ~[camel-http-common-4.13.0.jar:4.13.0]
> at org.apache.camel.http.common.CamelServlet.doService(CamelServlet.java:235)
> ~[camel-http-common-4.13.0.jar:4.13.0]
> at
> org.apache.camel.http.common.CamelServlet.handleService(CamelServlet.java:111)
> ~[camel-http-common-4.13.0.jar:4.13.0] {code}
>
> Simle example project of that error (just run test) -
> [https://github.com/Akvel/camel-header-error-example]
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