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Alex Humphreys 561e5bf9ab [kotlin][jvm-okhttp4] Fix multipart/form-data with JSON content-type (#22856 )

* [kotlin][jvm-okhttp4] Fix multipart/form-data with JSON content-type

Fixes #16457

Fixes two critical bugs in multipart/form-data handling when parts
have Content-Type application/json:

1. IllegalArgumentException: OkHttp throws "Unexpected header: Content-Type"
   because Content-Type was passed in headers map instead of via
   asRequestBody(mediaType)/toRequestBody(mediaType) parameter.

2. Invalid JSON serialization: Non-file parts with application/json
   Content-Type were serialized using toString() instead of proper
   JSON serialization, producing invalid output like:
   "MyObject(field1=value, field2=123)" instead of
   '{"field1":"value","field2":123}'

Changes:
- Filter Content-Type from headers before passing to OkHttp
- Check part Content-Type and use appropriate serializer (JSON vs toString)
- Add integration tests with echo server to verify fix
- Support all serialization libraries (gson, moshi, jackson, kotlinx)

Fixes issues with multipart endpoints that mix file uploads with
JSON metadata, common in REST APIs for document/image uploads.

* Run mvn clean/package, and regenerate samples

* Add fix for kotlinx serialisation issue

* Refactor multipart helpers for reified type parameter support

* Fix kotlinx.serialization multipart by adding serializer lambda to PartConfig

* Fix internal Ktor API usage in multipart forms

2026-02-04 19:44:39 +08:00

.openapi-generator

Prepare v7.20.0 release (#22738 )

2026-01-20 03:13:58 +08:00

docs

[kotlin] better oneOf, anyOf support (#18382 )

2024-05-31 12:22:27 +08:00

gradle/wrapper

[kotlin-client] update Kotlin and libraries versions (#21866 )

2025-09-16 02:01:29 +08:00

src

[kotlin][jvm-okhttp4] Fix multipart/form-data with JSON content-type (#22856 )

2026-02-04 19:44:39 +08:00

.openapi-generator-ignore

[Bug][Kotlin-client] Can now handle path param of type list (#12244 )

2022-05-05 01:04:20 +08:00

build.gradle.kts

[kotlin-client] update Kotlin and libraries versions (#21866 )

2025-09-16 02:01:29 +08:00

gradlew

[kotlin-client] update Kotlin and libraries versions (#21866 )

2025-09-16 02:01:29 +08:00

gradlew.bat

[kotlin-client] update Kotlin and libraries versions (#21866 )

2025-09-16 02:01:29 +08:00

README.md

Prepare v7.20.0 release (#22738 )

2026-01-20 03:13:58 +08:00

settings.gradle.kts

[kotlin][client] Add new line at the end of all files (#16062 )

2023-07-11 17:07:06 +08:00

README.md

org.openapitools.client - Kotlin client library for Demo

No description provided (generated by Openapi Generator https://github.com/openapitools/openapi-generator)

Overview

This API client was generated by the OpenAPI Generator project. By using the openapi-spec from a remote server, you can easily generate an API client.

API version: 1.0.0
Package version:
Generator version: 7.20.0-SNAPSHOT
Build package: org.openapitools.codegen.languages.KotlinClientCodegen

Requires

Kotlin 2.2.20

Build

./gradlew check assemble

This runs all tests and packages the library.

Features/Implementation Notes

Supports JSON inputs/outputs, File inputs, and Form inputs.
Supports collection formats for query parameters: csv, tsv, ssv, pipes.
Some Kotlin and Java types are fully qualified to avoid conflicts with types defined in OpenAPI definitions.

Documentation for API Endpoints

All URIs are relative to http://localhost

Class	Method	HTTP request	Description
DefaultApi	idsGet	GET /{ids}

Documentation for Models

Documentation for Authorization

Endpoints do not require authorization.