Ralph, Thanks for the reply and additional details. I may be misunderstanding, but just for clarification, in your diagram, are you expecting NiFi to act as the REST server? If that is the case, then you should be able to use one of the ConsumeKafka processors to retrieve messages and return them to the REST client. At a very basic level, the flow would go from HandleHttpRequest to ConsumeKafka to HandleHttpResponse. Depending on the format of the messages retrieved from Kafka, you may need to introduce additional processors prior to HandleHttpResponse in order to format the output for delivery to the REST client.
Regards, David Handermann On Thu, Feb 4, 2021 at 7:47 AM Ralph Vercauteren <r...@qad.com> wrote: > Hi David, > > Thanks for responding. > > I understand that part, still have the issue to see how we get the kafka > messages from a topic. > > [image: image.png] > > With regards, > Mit freundlichem Gruß, > Met vriendelijke groet, > > *Ralph Vercauteren* > Technical Architect QAD Automation Solutions > Mobile NL: +31 6 5397 7230 > r...@qad.com > > This e-mail may contain QAD proprietary information and should be treated > as confidential. > > > On Thu, Feb 4, 2021 at 2:21 PM David Handermann < > exceptionfact...@gmail.com> wrote: > >> Hi Ralph, >> >> If you are looking to create a REST service for receiving and processing >> messages in NiFi, take a look at the ListenHTTP processor, as well as the >> HandleHttpRequest and HandleHttpResponse processors. The ListenHTTP >> processor supports receiving HTTP requests and sending the contents to >> other processors. The ListenHTTP processor provides the easiest approach >> for getting started. If you need to perform validation or additional >> processing before sending back a response to REST clients, then using >> HandleHttpRequest and HandleHttpResponse with other processors in between >> can support that approach. When using HandleHttpRequest and >> HandleHttpResponse, it is important to optimize intermediate as much as >> possible to avoid HTTP clients timing out while waiting for a response. >> Both processors support a number of configuration properties, so be sure to >> read through the documentation for each one in order to determine the >> optimal settings for your configuration. >> >> Regards, >> David Handermann >> >> On Thu, Feb 4, 2021 at 3:32 AM Ralph Vercauteren <r...@qad.com> wrote: >> >>> Hi all, >>> >>> Not sure if I need to ask this in this mailing list or the list of the >>> developers. >>> >>> I want to create a REST server with NIFI. >>> >>> I have a Kafka queue storing messages. When something is connected to >>> the REST server, the Kafka queue has to be read and all waiting messages >>> should be collected and send back as a response to the REST client, >>> >>> I tried to google for a hint or solution, but I couldn't find it. >>> >>> With regards, >>> Mit freundlichem Gruß, >>> Met vriendelijke groet, >>> >>> *Ralph Vercauteren* >>> Technical Architect QAD Automation Solutions >>> Mobile NL: +31 6 5397 7230 >>> r...@qad.com >>> >>> This e-mail may contain QAD proprietary information and should be >>> treated as confidential. >>> >>
