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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] Test array integer (enum) with kotlin client generator (#22336 )

2025-11-12 16:39:01 +08:00

gradle/wrapper

[kotlin] Test array integer (enum) with kotlin client generator (#22336 )

2025-11-12 16:39:01 +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

[kotlin] Test array integer (enum) with kotlin client generator (#22336 )

2025-11-12 16:39:01 +08:00

build.gradle

[kotlin] Add integration test for query params (#22695 )

2026-01-14 15:34:53 +08:00

gradlew

[kotlin] Test array integer (enum) with kotlin client generator (#22336 )

2025-11-12 16:39:01 +08:00

gradlew.bat

[kotlin] Test array integer (enum) with kotlin client generator (#22336 )

2025-11-12 16:39:01 +08:00

README.md

Prepare v7.20.0 release (#22738 )

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

settings.gradle

[kotlin] Test array integer (enum) with kotlin client generator (#22336 )

2025-11-12 16:39:01 +08:00

README.md

org.openapitools.client - Kotlin client library for Issue 15204 Int Array Enum

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

Requires

Kotlin 2.2.20
Gradle 8.14

Build

First, create the gradle wrapper script:

gradle wrapper

Then, run:

./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.
Implementation of ApiClient is intended to reduce method counts, specifically to benefit Android targets.

Documentation for API Endpoints

All URIs are relative to http://localhost

Class	Method	HTTP request	Description
DefaultApi	operation	GET /

Documentation for Models

org.openapitools.client.models.ModelWithIntArrayEnum

Documentation for Authorization

Endpoints do not require authorization.