nigredo-tori opened a new issue, #574:
URL: https://github.com/apache/pekko-http/issues/574
I'm using Akka 10.2.9, but the issue doesn't seem to have been fixed in
Pekko as well. Sorry I don't have a reproduction example at this moment, I'm
creating this issue to have something to reference when rolling out a patch
that will hopefully give me a clue. :smile:
I have a piece of code like this:
```scala
`Content-Disposition`.parseFromValueString(headerValue)
```
I expect it to return an `Either`. Instead, for some input values it seems
to throw the following exception:
```
java.lang.NullPointerException: Cannot invoke "String.split(String, int)"
because "message" is null
at
akka.http.scaladsl.model.ErrorInfo$.fromCompoundString(ErrorInfo.scala:65)
at
akka.http.impl.model.parser.HeaderParser.failure(HeaderParser.scala:77)
at akka.http.scaladsl.model.HttpHeader$.parse(HttpHeader.scala:92)
at
akka.http.scaladsl.model.headers.ModeledCompanion.parseFromValueString(headers.scala:40)
<redacted>
```
It seems that there is an exception raised somewhere inside the parser that
doesn't have its message set.
[Here](https://github.com/akka/akka-http/blob/v10.2.9/akka-http-core/src/main/scala/akka/http/impl/model/parser/HeaderParser.scala#L77)
we do `.getMessage`, passing `null` into `ErrorInfo.fromCompoundString`. It
[tries to split
it](https://github.com/akka/akka-http/blob/v10.2.9/akka-http-core/src/main/scala/akka/http/scaladsl/model/ErrorInfo.scala#L65),
and we get an NPE.
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