Ktor Encoding, Text. As in the below example, you can then simply cr
- Ktor Encoding, Text. As in the below example, you can then simply create the appropriate file and copy the bytes from one stream (input) to the other (output). To use the Ktor HTTP client in your project, you need to configure repositories and add the following dependencies: ktor-client-core ktor-client-core contains core Ktor client functionality. http. UnsafeHeaderException: Header Content-Type is controlled by the engine and cannot be set explicitly Learn how to use Kotlin and Ktor to build a single-page application (SPA) in which RESTful services link to database repositories. If required, you can use the following validation strategies: Use the expectSuccess property to throw exceptions for non-2xx responses. Ktor 3. UnsafeHeaderException: Header Content-Type is controlled by the engine and cannot be set explicitly I can't figure out how to set the headers in the client constructor. FormUrlEncoded) } } } this code throws exception: io. content) with Accept-Encoding: gzip, I don't see normal text, just some binary data. However, the API I have to work with is not particularly well-designed, and so it only accepts %20 as a space, even in query parameters. 1 Ktor Engine Used(client or server and name) Http Client with Apache engine JVM Version, Operating System and Relevant Context JDK 11,MAC OS Feedback If ContentEncoding feature tu The Ktor client provides the ContentEncoding plugin that allows you to enable specified compression algorithms (such as gzip and deflate) and configure their settings. z) contain backward-compatible fixes. Mastering Kotlin Multiplatform Networking: Unleashing the Power of Kotlin Multiplatform and Ktor Integration with OpenAI API with Ease! A Ktor FileItem exposes an InputStream via streamProvider which can be used to access the raw bytes of the file which has been uploaded. I'm using the Ktor HttpClient (CIO) to make requests against an HTTP API whose response uses chunked transfer encoding. You can choose the content types to compress by calling matchContentType or exclude the desired media types from compression by using excludeContentType. Ktor has a receive method with generic. You can send different types of responses: plain text, HTML documents and templates, serialized data objects, and so on. InputProvider allows you to supply file data as a buffered stream rather than loading it entirely into memory, making it well-suited for large files. pdf val client = HttpClient (CIO) val response: H… On the next page, you can choose a set of plugins - building blocks that provide common functionality of a Ktor application, such as authentication, serialization and content encoding, compression, cookie support, and so on. Wanted my application to respond with a brotli compressed js script (as it is 30% smaller than the gzip version) but failed to overwrite the Content-Encoding in the response header with br. I get the error: io. While I have completely same headers and data, I found 2 issues: Ktor adds application/json to accept eve… By default, Ktor doesn't compress specific content types, such as audio, video, image, and text/event-stream. The kjson-ktor library includes functions to read a client response, deserialise it on the fly and hand each item to the calling function as it arrives. While this is efficient for small payloads, it may lead to high memory usage with large responses. OK) Server-Sent Events in Ktor Server Edit page Last modified: 20 October 2025 Required dependencies: io. Each platform requires a specific engine to process network requests. Typical usage scenarios include logging in users and gaining access to specific resources. Jul 9, 2020 · But I still cannot read request (using call. Similar to the ContentNegotiation plugin, WebSockets allow you to serialize/deserialize text frames in a specific format. With Ktor, you can serve content from folders, ZIP files, and embedded application resources. ktor-client-content-negotiation ktor-client-core ktor-client-curl ktor-client-darwin ktor-client-darwin-legacy ktor-client-encoding ktor-client-gson How do I use compression with ktor client I added an Accept Encoding gzip deflate header to my requests and now the responses I get are compressed How do I make ktor To stream large or dynamic content efficiently, you can use MultiPartFormDataContent with an InputProvider. Required dependencies: io. For example, you can replace the previous code with a get function that now only needs to take the URL and the code to handle the request: JSON functionality for ktor. Ktor allows adjustment of serialization behavior through Json configuration. This plugin serves three primary purposes: Sets the Accept-Encoding header with the specified quality value. 7 Framework for quickly creating connected applications in Kotlin with minimal effort - ktorio/ktor Feb 6, 2025 · This plugin allows you to process the plain text content in request and response: fills the Accept header with registered charsets, encode request body and decode response body according to ContentType charset. Thankfully, there’s a Ktor Documentation Ktor is a framework for building asynchronous server-side and client-side applications with ease. Plain, HttpStatusCode. Ktor is built from the ground up using Kotlin and Coroutines. If required, you can specify the serializer explicitly and configure it. val client = HttpClient (OkHttp) { engine { defaultRequest { contentType(ContentType. Edit page Last modified: 19 December 2025 The Ktor HTTP client is multiplatform and runs on JVM, Android, JavaScript (including WebAssembly), and Native targets. With MultiPartFormDataContent, you can also monitor upload progress using the onUpload callback. serialization requires the ktor-serialization-kotlinx-json dependency for JSON. I fail While it is certainly possible with Ktor to load the contents of a file and send it in a response to a client, Ktor simplifies this process by providing additional functions for serving static content. Previously, the API returned this response at the root path: call. Oct 20, 2025 · The Ktor client provides the ContentEncoding plugin that allows you to enable specified compression algorithms (such as gzip and deflate) and configure their settings. What do I need to do to read decoded text through ByteReadChannel? Ktor is a framework for quickly creating web applications in Kotlin with minimal effort. I can't figure out how to send a application/x-www-form-urlencoded POST request in Ktor. Add stricter validation of 2xx responses. Manually parsing incoming data and building a JSON string for every response is not ideal. Depending on the included artifacts, Ktor chooses a default serializer automatically. Streaming input is not quite as seamless as output; it requires a new function (an extension function on HttpClient). 6. Note that a specific platform may require a specific engine that processes network requests. UTF-8) in a response? call. To learn more about the SSE plugin for server-side support, see the SSE server plugin. Ktor falls back to ISO-8859-1 (see RequestContent. Is there any way I can tell Ktor to always encode spaces as %20 no matter the context? New Ktor Project Download a project skeleton using the provided options and plugins below. 0-rc Broken since 1. Digest - an authentication method that communicates user credentials in an encrypted form by applying a hash function to the username and password. respondText("{\\"message\\":\\"Hello World!\\"}") As we add new features, the API’s codebase will grow, and we will need to represent requests and responses using data classes to make the code more maintainable. 0) provide backward-compatible new functionality. You can perform various actions when handling requests: Get request information, such as headers, cookies, and so on. Is there a way to prevent Ktor from encoding the URL? Encoding: You can generate a URL-encoded string either from a List of Pairs of Strings or a Parameters instance: How can I explicitly set the character encoding (e. If you would like to contribute your own plugins, you can publish to the registry repository. kt:11). y. Receive body contents, for example, data objects, form parameters, and files. Request with Content-Type: application/json is decoded not as UTF-8, while request with C Ktor Version and Engine Used (client or server and name) Works up to 1. ktor. For example, kotlinx. It uses the Exposed SQL library and allows you to fake repositories for testing. Is there a way using the Ktor HttpClient (CIO) to get access to the individual Http Chunks in an HttpResponse, when calling an API that uses chunked transfer encoding? Ktor allows you to handle incoming requests and send responses inside route handlers. Get parameters of a query string. Optionally encodes request body. kt for Gzip and Deflate. Customize validation of non-2xx responses. How it is transformed to ByteArray if I call REST API and receive response body as ByteArray? I have a problem because I need to receive request body as Byte The onDownload() extension function in the example above is used to display download progress. 0. Further, the application/json entry on IANA has the not To stream large or dynamic content efficiently, you can use MultiPartFormDataContent with an InputProvider. Kotlin Server and Client Framework for microservices, HTTP APIs, and RESTful services Ktor is a lightweight and flexible web framework for Kotlin, designed to build scalable and Tagged with android, api, ktor, kotlin. Jan 22, 2026 · Ktor Client Encoding Ktor is a framework for quickly creating web applications in Kotlin with minimal effort. Ktor provides the Auth plugin to handle authentication and authorization in your client application. The URL string contains commas that are encoded by the Ktor client to %2C which is breaking the backend logic. 0-rc2 Describe the bug My software is making requests to an API and was working fine, after updating k RFC4627 Section 3 specifies that the default encoding of application/json is UTF-8. To handle large responses efficiently, use a streaming approach, which processes the Ktor also provides a series of functions that make defining route handlers much easier and more concise. I found an example of file uploading with ktor as a multiPart request. Apparently, responses were fixed, but there are still issues with the requests. Get started with Ktor Server Learn how to create, run and test a server application with Ktor. Saw the implementation in ktor-server/ktor-server-core/src/io/ktor/features/Compression. Modify properties like date formatting, null handling, and pretty printing by constructing a custom Json instance during ContentNegotiation setup. Every engine Learn the fundamentals of validation, error handling, and unit testing for services created with Kotlin and Ktor. Application. For Ktor returns 415 from endpoints where receive () is used with ContentNegotiation Asked 5 years, 6 months ago Modified 5 years, 6 months ago Viewed 4k times Ktor allows you to handle incoming requests and send responses inside route handlers. For example, you can use Apache or Jetty for JVM applications, OkHttp or Android for Android, Curl for desktop applications targeting Kotlin/Native. 0) contain incompatible API changes. 2. Generally is not recommended if not used in combination with HTTPS. . ktor:ktor-server-sse Code example: server-sse hi there. Ktor - Upload file What if the file name contains special characters? like Übung 001. Oct 20, 2025 · Note that serializers for specific formats require additional artifacts. Get path parameter values. 0 has been released, introducing significant enhancements and features for developers building Tagged with webdev, kotlin, java, beginners. Patch versions (x. Engine dependency Engines are used to process network requests. Decodes content received from a server to obtain the original payload. By default, Ktor doesn't validate a response depending on its status code. Hello, I have a sensitive server that can pass curl requests well but there are troubles with Ktor same requests. For non-streaming requests, the response body is automatically loaded and cached in memory, allowing repeated access. respondText ("Hello World!", ContentType. You get to use a concise, multiplatform language, as well as the power of asynchronous programming with an intuitive imperative flow. ktor-client cannot be used for URLs which are not supported by the URL Encoding format. Contribute to pwall567/json-ktor development by creating an account on GitHub. I see some submitForm helpers in Ktor's documentation but they don't send the request as expected. Edit page Last modified: 23 January 2026 Ktor follows Semantic Versioning: Major versions (x. For each major and minor release, we also ship several preview (EAP) versions for you to try new features before they are released. Ktor Version 1. You can also configure various response parameters, such as content type, headers, cookies, and the status code. Full encoded path with query string but without domain, port and schema The SSE plugins supported by Ktor provide a straightforward method for creating a one-way connection between the server and the client. Feb 15, 2022 · Does anyone know how to do this? Prevent Ktor from doing a URL_encode in the url parameters, I couldn't find anything in the documentation My code is this: ktor-client version 1. Cookie Encoding enum CookieEncoding : Enum <CookieEncoding> Headers interface Headers : StringValues In Ktor, you can use the following HTTP authentication schemes: Basic - uses Base64 encoding to provide a username and password. This is a follow up to #80. g. Subsystem ktor-client, ktor-http/common Is your feature request related to a problem? Please describe. The Ktor client supports the following formats out-of-the-box: JSON, XML, CBOR, and ProtoBuf. How do I set a Content Type Charset in Ktor client (Not an accept charset) Asked 5 years, 11 months ago Modified 5 years, 4 months ago Viewed 4k times 1 By default, Ktor encodes spaces as + in query parameters, which I understand is the general convention. Ktor is one of the most versatile frameworks for Kotlin Multiplatform networking, and in this article, we’ll dive into how easy it is to set up content negotiation and logging. Minor versions (x. To stream large or dynamic content efficiently, you can use MultiPartFormDataContent with an InputProvider. ktor:ktor-server-content-negotiation Code example: json-kotlinx Native server support: Framework for quickly creating connected applications in Kotlin with minimal effort - ktorio/ktor Plugins are building blocks that provide common functionality in a Ktor application, such as authentication, serialization and content encoding, compression, cookie support, and more. aobdr, 0epyj4, vcy53, obzmv, hn4fza, izfl, spmw7s, tsyyld, kursu, 0xhk,