diff --git a/src/main/kotlin/org/koitharu/kotatsu/parsers/network/OkHttpWebClient.kt b/src/main/kotlin/org/koitharu/kotatsu/parsers/network/OkHttpWebClient.kt
index 4400f430..31a8c637 100644
--- a/src/main/kotlin/org/koitharu/kotatsu/parsers/network/OkHttpWebClient.kt
+++ b/src/main/kotlin/org/koitharu/kotatsu/parsers/network/OkHttpWebClient.kt
@@ -23,9 +23,7 @@ class OkHttpWebClient(
 			.get()
 			.url(url)
 			.addTags()
-		if (extraHeaders != null) {
-			request.headers(extraHeaders)
-		}
+			.addExtraHeaders(extraHeaders)
 		return httpClient.newCall(request.build()).await().ensureSuccess()
 	}
 
@@ -37,7 +35,7 @@ class OkHttpWebClient(
 		return httpClient.newCall(request.build()).await().ensureSuccess()
 	}
 
-	override suspend fun httpPost(url: HttpUrl, form: Map<String, String>): Response {
+	override suspend fun httpPost(url: HttpUrl, form: Map<String, String>, extraHeaders: Headers?): Response {
 		val body = FormBody.Builder()
 		form.forEach { (k, v) ->
 			body.addEncoded(k, v)
@@ -46,10 +44,11 @@ class OkHttpWebClient(
 			.post(body.build())
 			.url(url)
 			.addTags()
+			.addExtraHeaders(extraHeaders)
 		return httpClient.newCall(request.build()).await().ensureSuccess()
 	}
 
-	override suspend fun httpPost(url: HttpUrl, payload: String): Response {
+	override suspend fun httpPost(url: HttpUrl, payload: String, extraHeaders: Headers?): Response {
 		val body = FormBody.Builder()
 		payload.split('&').forEach {
 			val pos = it.indexOf('=')
@@ -63,16 +62,18 @@ class OkHttpWebClient(
 			.post(body.build())
 			.url(url)
 			.addTags()
+			.addExtraHeaders(extraHeaders)
 		return httpClient.newCall(request.build()).await().ensureSuccess()
 	}
 
-	override suspend fun httpPost(url: HttpUrl, body: JSONObject): Response {
+	override suspend fun httpPost(url: HttpUrl, body: JSONObject, extraHeaders: Headers?): Response {
 		val mediaType = "application/json; charset=utf-8".toMediaType()
 		val requestBody = body.toString().toRequestBody(mediaType)
 		val request = Request.Builder()
 			.post(requestBody)
 			.url(url)
 			.addTags()
+			.addExtraHeaders(extraHeaders)
 		return httpClient.newCall(request.build()).await().ensureSuccess()
 	}
 
@@ -102,6 +103,13 @@ class OkHttpWebClient(
 		return this
 	}
 
+	private fun Request.Builder.addExtraHeaders(headers: Headers?): Request.Builder {
+		if (headers != null) {
+			headers(headers)
+		}
+		return this
+	}
+
 	private fun Response.ensureSuccess(): Response {
 		val exception: Exception? = when (code) { // Catch some error codes, not all
 			HttpURLConnection.HTTP_NOT_FOUND -> NotFoundException(message, request.url.toString())
diff --git a/src/main/kotlin/org/koitharu/kotatsu/parsers/network/WebClient.kt b/src/main/kotlin/org/koitharu/kotatsu/parsers/network/WebClient.kt
index a486824d..bddbb270 100644
--- a/src/main/kotlin/org/koitharu/kotatsu/parsers/network/WebClient.kt
+++ b/src/main/kotlin/org/koitharu/kotatsu/parsers/network/WebClient.kt
@@ -22,6 +22,11 @@ interface WebClient {
 	 */
 	suspend fun httpGet(url: HttpUrl): Response = httpGet(url, null)
 
+	/**
+	 * Do a GET http request to specific url
+	 * @param url
+	 * @param extraHeaders additional HTTP headers for request
+	 */
 	suspend fun httpGet(url: HttpUrl, extraHeaders: Headers?): Response
 
 	/**
@@ -41,42 +46,66 @@ interface WebClient {
 	 * @param url
 	 * @param form payload as key=>value map
 	 */
-	suspend fun httpPost(url: String, form: Map<String, String>): Response = httpPost(url.toHttpUrl(), form)
+	suspend fun httpPost(url: String, form: Map<String, String>): Response = httpPost(url.toHttpUrl(), form, null)
 
 	/**
 	 * Do a POST http request to specific url with `multipart/form-data` payload
 	 * @param url
 	 * @param form payload as key=>value map
 	 */
-	suspend fun httpPost(url: HttpUrl, form: Map<String, String>): Response
+	suspend fun httpPost(url: HttpUrl, form: Map<String, String>): Response = httpPost(url, form, null)
+
+	/**
+	 * Do a POST http request to specific url with `multipart/form-data` payload
+	 * @param url
+	 * @param form payload as key=>value map
+	 * @param extraHeaders additional HTTP headers for request
+	 */
+	suspend fun httpPost(url: HttpUrl, form: Map<String, String>, extraHeaders: Headers?): Response
+
+	/**
+	 * Do a POST http request to specific url with `multipart/form-data` payload
+	 * @param url
+	 * @param payload payload as `key=value` string with `&` separator
+	 */
+	suspend fun httpPost(url: String, payload: String): Response = httpPost(url.toHttpUrl(), payload, null)
 
 	/**
 	 * Do a POST http request to specific url with `multipart/form-data` payload
 	 * @param url
 	 * @param payload payload as `key=value` string with `&` separator
 	 */
-	suspend fun httpPost(url: String, payload: String): Response = httpPost(url.toHttpUrl(), payload)
+	suspend fun httpPost(url: HttpUrl, payload: String): Response = httpPost(url, payload, null)
 
 	/**
 	 * Do a POST http request to specific url with `multipart/form-data` payload
 	 * @param url
 	 * @param payload payload as `key=value` string with `&` separator
+	 * @param extraHeaders additional HTTP headers for request
+	 */
+	suspend fun httpPost(url: HttpUrl, payload: String, extraHeaders: Headers?): Response
+
+	/**
+	 * Do a POST http request to specific url with json payload
+	 * @param url
+	 * @param body
 	 */
-	suspend fun httpPost(url: HttpUrl, payload: String): Response
+	suspend fun httpPost(url: String, body: JSONObject): Response = httpPost(url.toHttpUrl(), body, null)
 
 	/**
 	 * Do a POST http request to specific url with json payload
 	 * @param url
 	 * @param body
 	 */
-	suspend fun httpPost(url: String, body: JSONObject): Response = httpPost(url.toHttpUrl(), body)
+	suspend fun httpPost(url: HttpUrl, body: JSONObject): Response = httpPost(url, body, null)
 
 	/**
 	 * Do a POST http request to specific url with json payload
 	 * @param url
 	 * @param body
+	 * @param extraHeaders additional HTTP headers for request
 	 */
-	suspend fun httpPost(url: HttpUrl, body: JSONObject): Response
+	suspend fun httpPost(url: HttpUrl, body: JSONObject, extraHeaders: Headers?): Response
 
 	/**
 	 * Do a GraphQL request to specific url