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https://issues.apache.org/jira/browse/CAMEL-24910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-24910.
---------------------------------
Resolution: Fixed
> rest - a path parameter and an incoming HTTP header of the same name are
> merged into a list, so a correct value fails
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: CAMEL-24910
> URL: https://issues.apache.org/jira/browse/CAMEL-24910
> Project: Camel
> Issue Type: Bug
> Components: camel-platform-http, rest
> Reporter: Claus Ibsen
> Priority: Major
> Fix For: 4.23.0
>
>
> A REST endpoint with a path parameter, {{/stock/{sku\}}}, sets the header
> {{sku}} from the path. When the request also carries an HTTP header of that
> name, the two are merged and the header becomes a {{List}}, so a route that
> reads {{${header.sku\}}} gets {{[X, CAMEL-MUG]}} instead of a value.
> Reproduced with the connect/http-client example of camel-jbang-examples
> (Camel 4.23.0-SNAPSHOT, platform-http on Vert.x):
> {noformat}
> $ curl -o /dev/null -w '%{http_code}' localhost:8080/stock/CAMEL-MUG
> 200
> $ curl -o /dev/null -w '%{http_code}' -H 'sku: CAMEL-MUG'
> localhost:8080/stock/CAMEL-MUG
> 404
> $ curl -H 'sku: X' localhost:8080/stock/CAMEL-MUG
> {"error": "unknown sku [X, CAMEL-MUG]"}
> {noformat}
> The value from the path is the one the route asked for and the one the
> contract describes, so it should win; an incoming header of the same name
> should not silently turn it into a list. Headers that do not clash
> ({{orderId}}, {{needed}}) are harmless.
> Found in the camel-jbang-mcp stepwise benchmark: the local model set the
> line's sku as a *header* rather than an exchange property, so its own HTTP
> call sent {{sku}} along, and every call to its own service answered 404 with
> the list in the message. The behaviour is a sharp edge for a person too: the
> error names a list, which nothing in the route explains.
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