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GH-3283: HTTP Inbound handle SpEL errors (#3289)

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* GH-3283: HTTP Inbound handle SpEL errors

Fixes https://github.com/spring-projects/spring-integration/issues/3283

* Process all the request message preparation exceptions
in the provided error channel to let target application
to make a decision about an appropriate HTTP status instead of
default 500 Server Error

* * Rephrase `ResponseStatusException` doc in the http.adoc

Co-authored-by: Gary Russell <grussell@vmware.com>

Co-authored-by: Gary Russell <grussell@vmware.com>
This commit is contained in:
Artem Bilan
2020-05-28 11:47:15 -04:00
committed by GitHub
parent 5bd6278fcb
commit ef939a09a4
3 changed files with 67 additions and 17 deletions
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5
src/reference/asciidoc/http.adoc
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@@ -431,6 +431,11 @@ If the error flow times out after a main flow timeout, `500 Internal Server Erro
NOTE: Previously, the default status code for a timeout was `200 OK`.
To restore that behavior, set `reply-timeout-status-code-expression="200"`.
Also starting with version 5.4, an error that is encountered while preparing the request message is sent to the error channel (if provided).
A decision about throwing an appropriate exception should be done in the error flow by examining the exception.
Previously, any exceptions were simply thrown, causing an HTTP 500 server error response status, but in some cases the problem can be caused by incorrect request params, so a `ResponseStatusException` with a 4xx client error status should be thrown instead.
See `ResponseStatusException` for more information.
The `ErrorMessage` sent to this error channel contains the original exception as the payload for analysis.
==== URI Template Variables and Expressions
By using the `path` attribute in conjunction with the `payload-expression` attribute and the `header` element, you have a high degree of flexibility for mapping inbound request data.