Yes, you typically use them for route internal metadata. But they are not lost when they enter and return from an endpoint, unless you or the component creates a fresh new exchange.
Please also see this SO: http://stackoverflow.com/questions/10330998/passing-values-between-processors-in-apache-camel On Wed, Nov 25, 2015 at 4:00 PM, Matt Sicker <boa...@gmail.com> wrote: > Properties get lost even more often than headers, though. They're only > copied when the entire Exchange is used instead of the message body or the > Message object. I use them for temporary metadata between Processors, > beans, etc. > > On 25 November 2015 at 06:54, Joakim Bjørnstad <joak...@gmail.com> wrote: > >> Hello, >> >> If you need metadata or a value on multiple endpoints, or to be used >> internally in your routes, it is better to put them in the >> exchangeProperties. Then copy them out to headers, when needed. Since >> headers are meant to be used at the protocol/component in/out, there >> is no guarantee they persist or be unchanged when the message returns. >> Also reduces unwanted metadata leaking out of your routes, for example >> to JMS, HTTP/SOAP as you mentioned. >> >> >> >> On Wed, Nov 25, 2015 at 12:52 AM, Matt Sicker <boa...@gmail.com> wrote: >> > I filter out what headers to send when making REST calls through http4 >> for >> > instance, so that's not an issue. When I make internal calls to networked >> > services (e.g., Kafka, Hazelcast, or pretty much anything other than the >> > message brokering components), I lose all my headers until the response >> > message is handled (and only some components save those headers). >> > >> > On 24 November 2015 at 16:36, ychawla <premiergenerat...@gmail.com> >> wrote: >> > >> >> That sounds sensible to me. The headers are for message and exchange >> >> metadata. Just be careful to not send them over the wire when you call >> an >> >> external component. >> >> >> >> >> >> >> >> -- >> >> View this message in context: >> >> >> http://camel.465427.n5.nabble.com/Am-I-using-headers-right-tp5774363p5774365.html >> >> Sent from the Camel - Users mailing list archive at Nabble.com. >> >> >> > >> > >> > >> > -- >> > Matt Sicker <boa...@gmail.com> >> >> >> >> -- >> Kind regards >> Joakim Bjørnstad >> > > > > -- > Matt Sicker <boa...@gmail.com> -- Kind regards Joakim Bjørnstad
