POST

Post requests can be made only via kotlin dsl. For post calls kohttp will set content type by rule that mentioned below.

Content type priority

Content type is set according to the following priority levels (higher is prioritized)

1. Form or Json in body : body() { json { ... } } ...

2. Custom body type : body(myContentType) { ... } ...

3. Header : header { "Content-type" to myContentType } ...

POST with form body.

form body has a application/x-www-form-urlencoded content type

val response: Response = httpPost {
    host = "postman-echo.com"
    path = "/post"

    param { ... }
    header { ... }

    body {
        form {                              //  Resulting form will not contain ' ', '\t', '\n'
            "login" to "user"               //  login=user&
            "email" to "[e-mail]" //  email=[e-mail]
        }
    }
    // or
    body {
        form("login=user&email=[e-mail]")
    }
}

POST with json body.

json body has a application/json content type

val response: Response = httpPost {
    host = "postman-echo.com"
    path = "/post"

    param { ... }
    header { ... }

    body {                                  //  Resulting json will not contain ' ', '\t', '\n'
        json {                              //  {
            "login" to "user"               //      "login": "user",
            "email" to "[e-mail]" //      "email": "[e-mail]" 
        }                                   //  }
    }
    // or
    body {
        json("""{"login":"user","email":"[e-mail]"}""")
    }
}

POST with various content type

In addition to form or json body content types it is possible to declare a custom content type.

body DSL support three data sources: file(), bytes() and string()

httpPost {
    body("application/json") {
        string("""{"login":"user","email":"[e-mail]"}""")
    }
}

val imageFile = File(getResource("/cat.gif").toURI())
httpPost {
    body(type = "image/gif") {
        file(imageFile)
    }
}

httpPost {
    body { // content type is optional, null by default
        bytes("string of bytes".toByteArray())
    }
}

POST with multipart body

val response = httpPost {
    url("http://postman-echo.com/post")

    multipartBody {
        +part("meta") {
            json {
                "token" to "$token"
            }
        }
        +part("image") {
            file(imageFile)
        }
    }
}