# Latest **URL:** https://softwaremill.community/latest.md [Latest](https://softwaremill.community/latest.md) · [Categories](https://softwaremill.community/categories.md) · [Tags](https://softwaremill.community/tags.md) --- ## [Welcome to our community!](https://softwaremill.community/t/welcome-to-our-community/7)
**Author:** [@system](https://softwaremill.community/u/system)\ **Replies:** 0\ **Last updated:** [December 7, 2022, 7:49pm UTC](https://softwaremill.community/t/welcome-to-our-community/7 "2022-12-07T19:49:20Z")
The first paragraph of this pinned topic will be visible as a welcome message to all new visitors on your homepage. It’s important! Edit this into a brief description of your community: Who is it for? What can they fi… --- ## [Zio-json 0.8+ needs java 17](https://softwaremill.community/t/zio-json-0-8-needs-java-17/541)
**Author:** [@oNouguier](https://softwaremill.community/u/oNouguier)\ **Replies:** 4\ **Last updated:** [June 10, 2026, 2:26pm UTC](https://softwaremill.community/t/zio-json-0-8-needs-java-17/541 "2026-06-10T14:26:52Z")
zio-json 0.8 and following need java 17. Is it planned to consider java 17 as minimum version for tapir / sttp ? --- ## [How best to go about proposing (and helping with) code-generation improvements?](https://softwaremill.community/t/how-best-to-go-about-proposing-and-helping-with-code-generation-improvements/542)
**Author:** [@jducoeur](https://softwaremill.community/u/jducoeur)\ **Replies:** 1\ **Last updated:** [June 9, 2026, 11:36am UTC](https://softwaremill.community/t/how-best-to-go-about-proposing-and-helping-with-code-generation-improvements/542 "2026-06-09T11:36:11Z")
Howdy, all! I’m new around here (although a longtime member of the Scala community). This is basically a preliminary question about process. Some context, to get started: My dayjob is essentially the successor compan… --- ## [ZIO Traces not child of tapir endpoint span](https://softwaremill.community/t/zio-traces-not-child-of-tapir-endpoint-span/540)
**Author:** [@oNouguier](https://softwaremill.community/u/oNouguier)\ **Replies:** 16\ **Last updated:** [May 30, 2026, 12:31pm UTC](https://softwaremill.community/t/zio-traces-not-child-of-tapir-endpoint-span/540 "2026-05-30T12:31:23Z")
Hi all, Using ZIO and open telemetry IMHO I have to provide an Interceptor propagates OpenTelemetry’s \`io.opentelemetry.context.Context\` (ThreadLocal) into zio-opentelemetry’s \`ContextStorage\` (FiberRef) for each Tapir… --- ## [Validation cost for tapir's Schema](https://softwaremill.community/t/validation-cost-for-tapirs-schema/538)
**Author:** [@susliko](https://softwaremill.community/u/susliko)\ **Replies:** 5\ **Last updated:** [February 24, 2026, 12:52pm UTC](https://softwaremill.community/t/validation-cost-for-tapirs-schema/538 "2026-02-24T12:52:47Z")
Hi! I am meditating over cpu profiles of an app running in production that uses tapir (with circe for json). I can see that a noticeable amount of samples are pointing at tapir Schema applyFieldsValidation method. The ap… --- ## [OpenTelemetryMetricsBackend and metrics cost ( cardinality )](https://softwaremill.community/t/opentelemetrymetricsbackend-and-metrics-cost-cardinality/539)
**Author:** [@oNouguier](https://softwaremill.community/u/oNouguier)\ **Replies:** 2\ **Last updated:** [February 19, 2026, 3:48pm UTC](https://softwaremill.community/t/opentelemetrymetricsbackend-and-metrics-cost-cardinality/539 "2026-02-19T15:48:34Z")
With OpenTelemetryMetricsBackend, it seems that too many metrics are produced, then cost is really expensive when billing is proportional with cardinality. Probably because URI and query parameters are part of emitted me… --- ## [Server interpreter for scala.js](https://softwaremill.community/t/server-interpreter-for-scala-js/536)
**Author:** [@mprevel](https://softwaremill.community/u/mprevel)\ **Replies:** 1\ **Last updated:** [February 9, 2026, 3:10pm UTC](https://softwaremill.community/t/server-interpreter-for-scala-js/536 "2026-02-09T15:10:13Z")
Hi, According to the docs (if I’m not mistaken), all the tapir server interpreters are targeting JVM. Is there a scala.js server interpreter? I’ve seen that http4s-ember-server is cross-compiled jvm/js/native, so mayb… --- ## [Mixing authentication and cors result in 500 response for preflight Method.OPTIONS call](https://softwaremill.community/t/mixing-authentication-and-cors-result-in-500-response-for-preflight-method-options-call/535)
**Author:** [@Seo](https://softwaremill.community/u/Seo)\ **Replies:** 2\ **Last updated:** [December 11, 2025, 11:28am UTC](https://softwaremill.community/t/mixing-authentication-and-cors-result-in-500-response-for-preflight-method-options-call/535 "2025-12-11T11:28:54Z")
I’m trying to define a “secured” endpoint, with authentication + cors (+ metrics). While the public endpoints work, the secured ones don’t, giving 500 internal error to the first Method.OPTIONS call. I can’t find docum… --- ## [How to ensure that a server supports all endpoints?](https://softwaremill.community/t/how-to-ensure-that-a-server-supports-all-endpoints/522)
**Author:** [@David\_Walend](https://softwaremill.community/u/David_Walend)\ **Replies:** 10\ **Last updated:** [December 3, 2025, 9:54pm UTC](https://softwaremill.community/t/how-to-ensure-that-a-server-supports-all-endpoints/522 "2025-12-03T21:54:24Z")
Tapir very naturally gives me endpoint vals that let me build clients and servers. I use these one-at-a-time with .serverLogic() , then aggregate them - literally a List - to build up a server. That’s working really well… --- ## [Sttp client with restricted headers](https://softwaremill.community/t/sttp-client-with-restricted-headers/533)
**Author:** [@tgabriel](https://softwaremill.community/u/tgabriel)\ **Replies:** 1\ **Last updated:** [November 28, 2025, 9:13am UTC](https://softwaremill.community/t/sttp-client-with-restricted-headers/533 "2025-11-28T09:13:03Z")
Hello, We just integrated tapir with sttp client in our project, and we found an impediment: we need to send the “host” header along, which is a restricted header for the underlying java HTTP client. I have found that … --- ## [swaggerUI from behind AWS API Gateway?](https://softwaremill.community/t/swaggerui-from-behind-aws-api-gateway/529)
**Author:** [@uri](https://softwaremill.community/u/uri)\ **Replies:** 5\ **Last updated:** [November 18, 2025, 3:27pm UTC](https://softwaremill.community/t/swaggerui-from-behind-aws-api-gateway/529 "2025-11-18T15:27:18Z")
Hi, We’d like to host out swaggerUI but it’s sitting behind an AWS API Gateway. I know about prependSecurity, but the swaggerUI makes additional requests. I’ve reviewed issues: 85, 136 & 474, but those don’t seem to pro… --- ## [Codecs for Tapir from OpenApi Specs?](https://softwaremill.community/t/codecs-for-tapir-from-openapi-specs/527)
**Author:** [@David\_Walend](https://softwaremill.community/u/David_Walend)\ **Replies:** 5\ **Last updated:** [October 27, 2025, 9:12am UTC](https://softwaremill.community/t/codecs-for-tapir-from-openapi-specs/527 "2025-10-27T09:12:43Z")
Today I’m pulling a 24K line OpenAPI spec into Tapir using Generate endpoint definitions from an OpenAPI YAML — Tapir 1.x documentation . I’m down from 600 errors at start to just 29 errors in the generated code. I thin… --- ## [OpenApi path refs?](https://softwaremill.community/t/openapi-path-refs/528)
**Author:** [@David\_Walend](https://softwaremill.community/u/David_Walend)\ **Replies:** 1\ **Last updated:** [October 27, 2025, 9:12am UTC](https://softwaremill.community/t/openapi-path-refs/528 "2025-10-27T09:12:01Z")
Do I need to do something extra to bring in OpenApi references from outside of my .yaml file? I’m trying to bring in just the paths we use from a massive OpenApiSpec, and generate code for just those. The path in the hu… --- ## [Is there an all-scala MOM-based interpreter?](https://softwaremill.community/t/is-there-an-all-scala-mom-based-interpreter/526)
**Author:** [@David\_Walend](https://softwaremill.community/u/David_Walend)\ **Replies:** 1\ **Last updated:** [October 7, 2025, 3:27pm UTC](https://softwaremill.community/t/is-there-an-all-scala-mom-based-interpreter/526 "2025-10-07T15:27:11Z")
tapir — Tapir 1.x documentation lists a lot of options to build an http system using Tapir. I see I can also use Tapir to generate Async API. Is there an all-scala interpreter that can use asynchronous message-based mid… --- ## [Getting remote IP using Netty](https://softwaremill.community/t/getting-remote-ip-using-netty/524)
**Author:** [@dicklieber](https://softwaremill.community/u/dicklieber)\ **Replies:** 2\ **Last updated:** [October 5, 2025, 4:46pm UTC](https://softwaremill.community/t/getting-remote-ip-using-netty/524 "2025-10-05T16:46:22Z")
I’m trying to add an access log to my Tapir application. Using NettySyncServer. I can’t find any way to get the remote IP address in my intercepter. I can look at the request ConnectionInfo but all three values, local, … --- ## [Conditional redirect from endpoint handlers?](https://softwaremill.community/t/conditional-redirect-from-endpoint-handlers/523)
**Author:** [@anatoliikmt](https://softwaremill.community/u/anatoliikmt)\ **Replies:** 5\ **Last updated:** [September 26, 2025, 10:34am UTC](https://softwaremill.community/t/conditional-redirect-from-endpoint-handlers/523 "2025-09-26T10:34:05Z")
Hi! I’m trying to do a redirect from an endpoint handler and so far am not having much luck doing it. Here’s my use case. The app is a flashcards app for memorizing various information. There are, among others, two end… --- ## [Help with handling http error status](https://softwaremill.community/t/help-with-handling-http-error-status/519)
**Author:** [@David\_Walend](https://softwaremill.community/u/David_Walend)\ **Replies:** 6\ **Last updated:** [September 19, 2025, 1:58pm UTC](https://softwaremill.community/t/help-with-handling-http-error-status/519 "2025-09-19T13:58:37Z")
I’m trying to follow the example at One-of variants — Tapir 1.x documentation but I’m getting IllegalArgumentException Cannot decode: Mismatch(500,404) instead of the expected Left\[ErrorInfo,Unit\] . My endpoint looks l… --- ## [Nested Tapir-ZIO-routes return 404 always](https://softwaremill.community/t/nested-tapir-zio-routes-return-404-always/521)
**Author:** [@Thijs](https://softwaremill.community/u/Thijs)\ **Replies:** 6\ **Last updated:** [September 12, 2025, 5:05pm UTC](https://softwaremill.community/t/nested-tapir-zio-routes-return-404-always/521 "2025-09-12T17:05:32Z")
I have a set of Tapir ZServerEndpoint which I want to include in a zio-http server which also runs other, non-tapir defined endpoints. When I add them as-is it works as expected but when I try to serve the routes at a di… --- ## [.errorOut(whatever mess went wrong)?](https://softwaremill.community/t/errorout-whatever-mess-went-wrong/520)
**Author:** [@David\_Walend](https://softwaremill.community/u/David_Walend)\ **Replies:** 4\ **Last updated:** [September 3, 2025, 8:20am UTC](https://softwaremill.community/t/errorout-whatever-mess-went-wrong/520 "2025-09-03T08:20:04Z")
I’m putting together a ping API to check the health of a system. I want whatever mess comes back when things are broken - not specific errors. What’s a reasonable way to specify that? (I didn’t stumble into a general ca… --- ## [Custom Tapir Schema for self-recursive ADT](https://softwaremill.community/t/custom-tapir-schema-for-self-recursive-adt/517)
**Author:** [@mihaisoloi](https://softwaremill.community/u/mihaisoloi)\ **Replies:** 1\ **Last updated:** [August 16, 2025, 2:57pm UTC](https://softwaremill.community/t/custom-tapir-schema-for-self-recursive-adt/517 "2025-08-16T14:57:22Z")
I’ve got a rather simple structure that I have to expose as an API, initially I thought of defining these as just case classes but I ended up with over 60 different case classes and that is a pain to test and to generate… --- ## [AuthedRoutes with Websocket](https://softwaremill.community/t/authedroutes-with-websocket/514)
**Author:** [@channingwalton](https://softwaremill.community/u/channingwalton)\ **Replies:** 1\ **Last updated:** [July 25, 2025, 8:51am UTC](https://softwaremill.community/t/authedroutes-with-websocket/514 "2025-07-25T08:51:02Z")
Hi, I am building an Authed websocket route, so have: val endpoint: Endpoint\[Unit, User, ErrorResponse, Pipe\[IO, In, Out\], capabilities.WebSockets with Context\[User\] with Fs2Streams\[IO\] \] = … def thePipe(user: User)… --- ## [Map 22+ query params to case class](https://softwaremill.community/t/map-22-query-params-to-case-class/301)
**Author:** [@Ravenow](https://softwaremill.community/u/Ravenow)\ **Replies:** 3\ **Last updated:** [July 25, 2025, 8:05am UTC](https://softwaremill.community/t/map-22-query-params-to-case-class/301 "2025-07-25T08:05:10Z")
Hi, I have endpoint with 23+ query params, and of sake of convenience I\`ve mapped them to case class. query\[Option\[String\]\]("q1") .and(query\[Option\[String\]\]("q2")) .and(query\[Option\[String\]\]("q3")) … --- ## [Making a Tapir secure endpoint proxyable](https://softwaremill.community/t/making-a-tapir-secure-endpoint-proxyable/507)
**Author:** [@anthonywlucid](https://softwaremill.community/u/anthonywlucid)\ **Replies:** 1\ **Last updated:** [July 9, 2025, 10:19am UTC](https://softwaremill.community/t/making-a-tapir-secure-endpoint-proxyable/507 "2025-07-09T10:19:16Z")
Hello, I’m interested in taking an existing secure Tapir endpoint, and being able to use its inputs to check a table and proxy to the same endpoint on another server if need be. For public endpoints, I think Tapir would… --- ## [java.nio.file.Path as TapirFile](https://softwaremill.community/t/java-nio-file-path-as-tapirfile/505)
**Author:** [@tom91136](https://softwaremill.community/u/tom91136)\ **Replies:** 1\ **Last updated:** [June 26, 2025, 8:55am UTC](https://softwaremill.community/t/java-nio-file-path-as-tapirfile/505 "2025-06-26T08:55:52Z")
Hello, Long time Tapir user here, so far very happy with it. The other day I wanted to serve files in a jar/zip file with correct content ranges and the usual things you would expect from static files. This ended up n… --- ## [JSON Schema to Tapir Schema](https://softwaremill.community/t/json-schema-to-tapir-schema/499)
**Author:** [@sangamon](https://softwaremill.community/u/sangamon)\ **Replies:** 6\ **Last updated:** [June 17, 2025, 11:23am UTC](https://softwaremill.community/t/json-schema-to-tapir-schema/499 "2025-06-17T11:23:29Z")
I have a dynamically generated JSON Schema representation in json-sKema, and would like to build/derive a corresponding Tapir schema from it to a) describe and validate a request body and b) render full OpenAPI endpoint … --- ## [TapirSchemaToJsonSchema does not resolve the root reference](https://softwaremill.community/t/tapirschematojsonschema-does-not-resolve-the-root-reference/488)
**Author:** [@karelsk](https://softwaremill.community/u/karelsk)\ **Replies:** 2\ **Last updated:** [May 16, 2025, 8:49am UTC](https://softwaremill.community/t/tapirschematojsonschema-does-not-resolve-the-root-reference/488 "2025-05-16T08:49:02Z")
We have a coproduct where the root trait is referenced from a child. When we try to convert auto-generated tapir schema to apispec json schema the child schemas are referenced from $defs object but not the root schema. I… --- ## [Redirects for HEAD requests](https://softwaremill.community/t/redirects-for-head-requests/492)
**Author:** [@polymorphic](https://softwaremill.community/u/polymorphic)\ **Replies:** 2\ **Last updated:** [May 15, 2025, 10:43pm UTC](https://softwaremill.community/t/redirects-for-head-requests/492 "2025-05-15T22:43:05Z")
Hello, I’m using version 3.11.0 and noticed that HEAD requests don’t seem to follow redirects? Here’s an example similar to the sample code from the docs, modified accordingly: val syncBackend = HttpClientSyncBacken… --- ## [Compile error when deriving a schema in Scala 3, which works in Scala 2](https://softwaremill.community/t/compile-error-when-deriving-a-schema-in-scala-3-which-works-in-scala-2/490)
**Author:** [@jumale](https://softwaremill.community/u/jumale)\ **Replies:** 4\ **Last updated:** [May 13, 2025, 2:09pm UTC](https://softwaremill.community/t/compile-error-when-deriving-a-schema-in-scala-3-which-works-in-scala-2/490 "2025-05-13T14:09:36Z")
Hi, I’m currently checking if my Scala 2 project (which uses Tapir) can be migrated to Scala 3. I’ve reached one compiler-error, which I don’t fully understand, and I hope maybe someone here could help me with understa… --- ## [Disable transfer-encoding chunked](https://softwaremill.community/t/disable-transfer-encoding-chunked/485)
**Author:** [@MaxPeroch](https://softwaremill.community/u/MaxPeroch)\ **Replies:** 0\ **Last updated:** [May 1, 2025, 10:06pm UTC](https://softwaremill.community/t/disable-transfer-encoding-chunked/485 "2025-05-01T22:06:42Z")
Hello, Is there any way to disable “transfer-encoding chunked” when sending a multipart request? My understanding is that if the content length is provided, it shouldn’t chunk the request, right? I’m actually unsure if… --- ## [Tapir/ sttp scala.js websockets support status](https://softwaremill.community/t/tapir-sttp-scala-js-websockets-support-status/482)
**Author:** [@mprevel](https://softwaremill.community/u/mprevel)\ **Replies:** 2\ **Last updated:** [April 8, 2025, 12:55pm UTC](https://softwaremill.community/t/tapir-sttp-scala-js-websockets-support-status/482 "2025-04-08T12:55:33Z")
Hi, I’m currently trying to connect to a websocket endpoint, described with tapir, using a scala.js client. According to the docs ( Scala.js (Fetch) backend — sttp 4 documentation ), it can be done with Monix. Unfortun… [Next page](https://softwaremill.community/latest.md?page=1)