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Ok2Curl Commit check Android Arsenal Release

Simply way to transform OkHttp requests into curl logs.

Supported OkHttp versions

Currently Ok2Curl requires OkHttp in version 4.x.


Add library to project dependencies. Library is hosted on Maven Central.

repositories {

dependencies {
    implementation 'com.github.mrmike:ok2curl:0.8.0'

To start logging requests with Ok2Curl add interceptor to OkHttp client.

val client = OkHttpClient.Builder()
    .addInterceptor(CurlInterceptor(object : Logger {
        override fun log(message: String) {
            Log.v("Ok2Curl", message)


With Ok2Curl set up correctly every executed request will be transformed into curl log e.g.

adb logcat -s "Ok2Curl"
curl -X GET -H "Cache-Control:max-stale=2147483647, only-if-cached"

Network interceptors

By default Ok2Curl uses application interceptors from OkHttp which is adequate for most cases. But sometimes you may want to use network interceptor e.g. to log Cookies set via CookieHandler. In such a case add interceptor the same way as below:

val client = OkHttpClient.Builder()

To get know more about Interceptor in OkHttp take a look here:


CurlInterceptor accepts an optional configuration object. With Configuration you can specify various options like:

  • header modifiers - custom logic for modifying header values
  • components - list of required command components
  • flags - optional curl flags
  • limit - bytes limit for body
  • delimiter for command components
class Configuration(
    val headerModifiers: List<HeaderModifier> = emptyList(),
    val components: List<CommandComponent> = CommandComponent.DEFAULT,
    val flags: Flags = Flags.EMPTY,
    val limit: Long = 1024L * 1024L,
    val delimiter: String = " "

Header modifiers

Ok2Curl allows you to modify any header before creating curl command. All you have to do is create your own modifier that implements HeaderModifier and add this modifier to CurlInterceptor. See sample for reference.

val modifier = BasicAuthorizationHeaderModifier(Base64Decoder())
val configuration = Configuration(headerModifiers = listOf(modifier))
val curlInterceptor = CurlInterceptor(AndroidLogger(), configuration)

Command Components

With Ok2Curl configuration you can specify a list of components for curl command. For instance, you can skip header, body, and flag components.

val components = listOf(Curl, Method, Url)
val configuration = Configuration(components = components)
val curlInterceptor = CurlInterceptor(AndroidLogger(), configuration)

As a result, CurlInterceptor will receive given simplified command

// Headers, body and flags are skipped
curl -X GET


Ok2Curl supports basic Curl options. To use options use the following code:

val flags = Flags.builder()
            .connectTimeout(seconds = 120)
val configuration = Configuration(flags = flags)
val curlInterceptor = CurlInterceptor(AndroidLogger(), configuration)

Since now every Curl command will start with curl --insecure --connect-timeout 120 --retry 5...

Supported options

  • --insecure
  • --max-time seconds
  • --connect-timeout seconds
  • --retry num
  • --compressed
  • --location

If would like to support any new options please feel free to open PR. A full list of curl options is available here.


Copyright 2018 Michał Moczulski

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.