# How would you send the same request to multiple endpoints based on a list? **URL:** \ **Category:** Gatling (Open-Source)\ **Created:** [August 6, 2014, 1:40pm UTC](https://community.gatling.io/t/how-would-you-send-the-same-request-to-multiple-endpoints-based-on-a-list/1245 "2014-08-06T13:40:45Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![jarrowwx](https://avatars.discourse-cdn.com/v4/letter/j/4af34b/32.png) [@jarrowwx](https://community.gatling.io/u/jarrowwx)\ **Post date:** [August 6, 2014, 1:40pm UTC](https://community.gatling.io/t/how-would-you-send-the-same-request-to-multiple-endpoints-based-on-a-list/1245/1 "2014-08-06T13:40:45Z")
I have a scenario that loads a page and reads four RESTful services that return JSON objects. I need to build a single JSON object to send back to the server, but I need to conditionally send it back based on what was in those JSON objects. Specifically, if the first service had zero objects returned, I skip it. If it had one, I send a request to the server with my built object. If it has two or more, I send a response to the server for each one. I need to repeat that with different URLs for each of those objects. If I were doing this declaratively, or in native scala, I would just loop over the objects returned by the restful service and compose the appropriate URL and then send it. What is the “Gatling-Way” of doing that? ---
**Author:** ![jarrowwx](https://avatars.discourse-cdn.com/v4/letter/j/4af34b/32.png) [@jarrowwx](https://community.gatling.io/u/jarrowwx)\ **Post date:** [August 6, 2014, 5:49pm UTC](https://community.gatling.io/t/how-would-you-send-the-same-request-to-multiple-endpoints-based-on-a-list/1245/2 "2014-08-06T17:49:37Z")
It appears to be .foreach() which I’m playing with. However, all is not well, yet… I’m doing something like this: .exec( session =\> session.set( THE\_ID\_LIST, “” ) ) … .check( jsonPath("$.result[\*].id" ).findAll.dontValidate.saveAs( THE\_ID\_LIST ) … .exec( session =\> { println( "THE\_ID\_LIST: " + session( THE\_ID\_LIST ).as[String] ) // THE\_ID\_LIST: Vector() session }) … .doIf( session =\> session( THE\_ID\_LIST ).as[String] != “” ) { foreach( THE\_ID\_LIST, THE\_ID ) { … } } Now, looking at the documentation, foreach takes a string, uses that as the key to find the Iterable in the Session, and iterates over it. THE\_ID\_LIST is a string constant. Clearly, the session contains a key for that string. But when I run it, I get an error: 13:44:19.139 [ERROR] i.g.c.s.LoopBlock$ - Condition evaluation crashed with message ‘Can’t cast value theIdList of type class java.lang.String into interface scala.collection.Seq’, exiting loop Looks like we have a bug in there somewhere. FYI, I just tested with 2.0.0-RC1, same problem. Thanks! ---
**Author:** ![jarrowwx](https://avatars.discourse-cdn.com/v4/letter/j/4af34b/32.png) [@jarrowwx](https://community.gatling.io/u/jarrowwx)\ **Post date:** [August 6, 2014, 5:53pm UTC](https://community.gatling.io/t/how-would-you-send-the-same-request-to-multiple-endpoints-based-on-a-list/1245/3 "2014-08-06T17:53:59Z")
On a whim, I tried modifying it to: .foreach( “${” + THE\_ID\_LIST + “}”, THE\_ID ) { and it looks like it may have actually worked. Is that the way it is supposed to be? ---
**Author:** ![Nicolas\_R](https://avatars.discourse-cdn.com/v4/letter/n/f14d63/32.png) [@Nicolas\_R](https://community.gatling.io/u/Nicolas_R)\ **Post date:** [August 6, 2014, 5:56pm UTC](https://community.gatling.io/t/how-would-you-send-the-same-request-to-multiple-endpoints-based-on-a-list/1245/4 "2014-08-06T17:56:33Z")
Hi, .check( jsonPath("$.result[\*].id" ). **findAll**.dontValidate.saveAs( THE\_ID\_LIST ) Can you try with .find instead ? thanks Nicolas ---
**Author:** ![jarrowwx](https://avatars.discourse-cdn.com/v4/letter/j/4af34b/32.png) [@jarrowwx](https://community.gatling.io/u/jarrowwx)\ **Post date:** [August 6, 2014, 6:15pm UTC](https://community.gatling.io/t/how-would-you-send-the-same-request-to-multiple-endpoints-based-on-a-list/1245/5 "2014-08-06T18:15:13Z")
Does .find with a wildcard operate the same as .findAll()? Because the .findAll part is working fine. The part that is not visible in my code snippet is this: val THE\_ID\_LIST = “theIdList” If I take out that indirection, it might become more clear what is going on: foreach( “theIdList”, “theId” ) { Does NOT work, but… foreach( “${theIdList}”, “theId” ) { Does. Is that expected behavior? ---
**Author:** ![Pierre\_DAL-PRA](https://avatars.discourse-cdn.com/v4/letter/p/ecccb3/32.png) [@Pierre\_DAL-PRA](https://community.gatling.io/u/Pierre_DAL-PRA)\ **Post date:** [August 6, 2014, 6:27pm UTC](https://community.gatling.io/t/how-would-you-send-the-same-request-to-multiple-endpoints-based-on-a-list/1245/6 "2014-08-06T18:27:00Z")
Hi John, This in an expected behaviour : _foreach_’s first parameter takes is an Expression[Seq[Any]], meaning an EL expression which resolves to a list or a function which takes a Session and returns a list. This explains why “theIdList”, which is not an EL string, does not work whereas “${theIdList}” does. ---
**Author:** ![Pierre\_DAL-PRA](https://avatars.discourse-cdn.com/v4/letter/p/ecccb3/32.png) [@Pierre\_DAL-PRA](https://community.gatling.io/u/Pierre_DAL-PRA)\ **Post date:** [August 6, 2014, 6:28pm UTC](https://community.gatling.io/t/how-would-you-send-the-same-request-to-multiple-endpoints-based-on-a-list/1245/7 "2014-08-06T18:28:33Z")
However, the documentation is not exactly clear on that matter, I’ll make sure to clear that out 😉 Cheers, Pierre ---
**Author:** ![jarrowwx](https://avatars.discourse-cdn.com/v4/letter/j/4af34b/32.png) [@jarrowwx](https://community.gatling.io/u/jarrowwx)\ **Post date:** [August 6, 2014, 6:44pm UTC](https://community.gatling.io/t/how-would-you-send-the-same-request-to-multiple-endpoints-based-on-a-list/1245/8 "2014-08-06T18:44:27Z")
Thanks, guys!