我想使用Kotlin和Retrofit连接到天巡应用程序接口。https://rapidapi.com/skyscanner/api/skyscanner-flight-search
当我尝试POST 'create session'调用时，我得到了一个500错误，但是日志没有给出具体的原因。我只能假设我的post数据没有被正确格式化，但是我正在使用Retrofit with GSon来处理这个问题。
一个线索是，在他们的Java示例代码中，他们以以下格式传递表单数据：“inboundDate=2019-09-10&children=0&adults=1”而在从我的sessionObject类进行GSon转换后，我的数据格式为{“adults”：1，“country”：“GB”，“outboundDate”：“2020-01-06”}-我不确定如何使用Retrofit以该格式传递我的数据，以及这是否是导致500的问题。
下面是一些代码片段：

// my object for posting data
class SessionBody {

    @SerializedName("country")
    var country: String = ""
    @SerializedName("currency")
    var currency: String = ""
    ...etc...

// my interface
@Headers("Content-Type: application/x-www-form-urlencoded")
@POST("pricing/v1.0/")
fun postUser(@Body sessionBody: SessionBody): Call<Void>

// my connector class
val interceptor = HttpLoggingInterceptor()
interceptor.level = HttpLoggingInterceptor.Level.BODY
val client = OkHttpClient.Builder()
    .addInterceptor(Interceptor { chain ->
    val original = chain.request()
    val request = original.newBuilder()
        .header("X-RapidAPI-Host", "skyscanner-skyscanner-flight-search-   v1.p.rapidapi.com")
        .header("X-RapidAPI-Key", "...my key here...")
        .method(original.method(), original.body())
        .build()
    return@Interceptor chain.proceed(request)
})
.addInterceptor(interceptor)
.connectTimeout(30, TimeUnit.SECONDS)
.readTimeout(30, TimeUnit.SECONDS)
.build()

val retrofit = Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create(GsonBuilder().create()))
.client(client)
.build()

val api = retrofit.create(TravelEzyApi::class.java)
val call = api.postUser(sessionBody)

这是日志的输出...

D/OkHttp: --> POST https://skyscanner-skyscanner-flight-search-v1.p.rapidapi.com/apiservices/pricing/v1.0/
D/OkHttp: Content-Type: application/x-www-form-urlencoded
Content-Length: 142
X-RapidAPI-Host: skyscanner-skyscanner-flight-search-v1.p.rapidapi.com
X-RapidAPI-Key: ... my key here ...
{"adults":1,"country":"GB","currency":"GBP","destinationPlace":"BKK-sky","locale":"en-GB","originPlace":"LHR-sky","outboundDate":"2020-01-06"}
--> END POST (142-byte body)
D/OkHttp: <-- 500 Internal Server Error 
D/OkHttp: Cache-Control: private
Content-Type: application/json
Date: Tue, 22 Oct 2019 10:48:44 GMT
Server: RapidAPI-1.0.32
X-RapidAPI-Region: AWS - eu-west-1
X-RapidAPI-Version: 1.0.32
Content-Length: 2
Connection: keep-alive
{}
D/OkHttp: <-- END HTTP (2-byte body)

任何帮助或线索，不胜感激。