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Add file-transfer module: multipart limits, filename handling, Range downloads, streaming under -Xmx64m, S3 presigned URLs

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01VRLbHYdXVEBzGVhYq3pz4q
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Claude
2026-10-17 15:41:24 +00:00
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| [`kotlin/`](kotlin) | [Kotlin with Spring Boot 4.1: Null Safety, Coroutines, and What Java Developers Get Wrong](https://ankurm.com/) | Kotlin 2.3.21 (Boot 4.1.1's own managed version, not the latest GA), the real `@Configuration class may not be final` and `@Bean method must not be private or final` failures without the allopen/noarg `spring`/`jpa` compiler plugins, `suspend fun`/`Flow<T>` controller methods proven to still resume off a Tomcat thread under plain `spring-boot-starter-webmvc`, a JSpecify `@NullMarked` Java method that still NPEs at runtime because the contract isn't runtime-checked, and `TestRestTemplate` confirmed absent from Boot 4.1's `spring-boot-test` jar |
| [`testing-no-containers/`](testing-no-containers) | [Testing Spring Boot 4 Without Containers: WireMock, MockWebServer and @MockitoBean](https://ankurm.com/) | `@MockBean`'s total removal proven with a real `javac` failure, `@MockitoBean`/`@MockitoSpyBean` context-cache behavior proven with real `org.springframework.test.context.cache` DEBUG log lines, WireMock fault injection against a real `RestClient`, a real `NoClassDefFoundError` from mixing `wiremock` with `wiremock-jetty12` (fixed with `wiremock-standalone`), and MockWebServer's `SocketEffect.ShutdownConnection` for genuinely severing a connection mid-response |
| [`rest-test-client/`](rest-test-client) | [RestTestClient in Spring Framework 7: Testing REST APIs End-to-End (vs MockMvcTester)](https://ankurm.com/resttestclient-spring-framework-7-end-to-end-testing/) | one fluent `RestTestClient` API proven across `bindToController`, `bindTo(mockMvc)`, `bindToApplicationContext` and `bindToServer`; `RestTestClient`, `TestRestTemplate` and `@WebMvcTest` confirmed relocated into new Spring Boot 4 modules by unzipping the real jars; two distinct real failures for the two now-separate `@AutoConfigureRestTestClient`/`@AutoConfigureTestRestTemplate` annotations; and the JDK `HttpClient` Boot picks for `bindToServer` caught transparently decoding gzip and hiding `Content-Encoding`, verified against `curl` and against the older `SimpleClientHttpRequestFactory` |
| [`file-transfer/`](file-transfer) | [File Upload and Download in Spring Boot 4: Multipart, Streaming and S3 Presigned URLs](https://ankurm.com/file-upload-download-spring-boot-4-multipart-streaming-s3-presigned-urls/) | multipart limits enforced by Tomcat (and ignored by `MockMvc`), the client-controlled filename, `Range` downloads, a 200 MB download and 150 MB upload under `-Xmx64m`, and S3 presigned URLs checked against a local SigV4 verifier (not a real S3) |
`core-di`, `core-beans`, `custom-starter`, `core-events`, `multi-datasource`, `i18n`, `aot-cache`, `kotlin`, `testing-no-containers`, `rest-test-client` and `hexagonal` are the exception: they have **no `docs/NN-topic.md` chapter folder**. Their deeper material lives in
collapsible sections inside the articles themselves. Where their captured output sits is not