diff --git a/containers.v b/containers.v
index 545cce1..6981a2c 100644
--- a/containers.v
+++ b/containers.v
@@ -12,7 +12,7 @@ pub struct ContainerListConfig {
 }
 
 pub fn (mut d DockerConn) container_list(c ContainerListConfig) ![]ContainerListItem {
-	d.request(.get, '/containers/json', {})
+	d.request(.get, '/containers/json')
 	d.params(c)
 	d.send()!
 
@@ -35,7 +35,7 @@ pub:
 }
 
 pub fn (mut d DockerConn) container_create(c NewContainer) !CreatedContainer {
-	d.request(.post, '/containers/create', {})
+	d.request(.post, '/containers/create')
 	d.body_json(c)
 	d.send()!
 
@@ -44,7 +44,7 @@ pub fn (mut d DockerConn) container_create(c NewContainer) !CreatedContainer {
 
 // start_container starts the container with the given id.
 pub fn (mut d DockerConn) container_start(id string) ! {
-	d.request(.post, '/containers/$id/start', {})
+	d.request(.post, '/containers/$id/start')
 	d.send()!
 	d.read_response()!
 }
@@ -68,7 +68,7 @@ pub mut:
 }
 
 pub fn (mut d DockerConn) container_inspect(id string) !ContainerInspect {
-	d.request(.get, '/containers/$id/json', {})
+	d.request(.get, '/containers/$id/json')
 	d.send()!
 
 	mut data := d.read_json_response<ContainerInspect>()!
@@ -84,13 +84,14 @@ pub fn (mut d DockerConn) container_inspect(id string) !ContainerInspect {
 }
 
 pub fn (mut d DockerConn) container_remove(id string) ! {
-	d.request(.delete, '/containers/$id', {})
+	d.request(.delete, '/containers/$id')
 	d.send()!
 	d.read_response()!
 }
 
 pub fn (mut d DockerConn) container_get_logs(id string) !&StreamFormatReader {
-	d.request(.get, '/containers/$id/logs', {
+	d.request(.get, '/containers/$id/logs')
+	d.params({
 		'stdout': 'true'
 		'stderr': 'true'
 	})
diff --git a/images.v b/images.v
index 1da31c7..76df20d 100644
--- a/images.v
+++ b/images.v
@@ -3,7 +3,7 @@ module docker
 import types { Image }
 
 pub fn (mut d DockerConn) image_inspect(image string) !Image {
-	d.request(.get, '/images/$image/json', {})
+	d.request(.get, '/images/$image/json')
 	d.send()!
 
 	data := d.read_json_response<Image>()!
@@ -13,7 +13,8 @@ pub fn (mut d DockerConn) image_inspect(image string) !Image {
 
 // image_pull pulls the given image:tag.
 pub fn (mut d DockerConn) image_pull(image string, tag string) ! {
-	d.request(.post, '/images/create', {
+	d.request(.post, '/images/create')
+	d.params({
 		'fromImage': image
 		'tag':       tag
 	})
@@ -33,7 +34,8 @@ pub fn (mut d DockerConn) image_pull(image string, tag string) ! {
 
 // create_image_from_container creates a new image from a container.
 pub fn (mut d DockerConn) image_from_container(id string, repo string, tag string) !Image {
-	d.request(.post, '/commit', {
+	d.request(.post, '/commit')
+	d.params({
 		'container': id
 		'repo':      repo
 		'tag':       tag
@@ -45,13 +47,17 @@ pub fn (mut d DockerConn) image_from_container(id string, repo string, tag strin
 
 // remove_image removes the image with the given id.
 pub fn (mut d DockerConn) image_remove(id string) ! {
-	d.request(.delete, '/images/$id', {})
+	d.request(.delete, '/images/$id')
 	d.send()!
 	d.read_response()!
 }
 
 pub fn (mut d DockerConn) image_tag(name string, repo string, tag string) ! {
-    d.request(.post, '/images/$name/tag', {'repo': repo, 'tag': tag})
-    d.send()!
-    d.read_response()!
+	d.request(.post, '/images/$name/tag')
+	d.params({
+		'repo': repo
+		'tag':  tag
+	})
+	d.send()!
+	d.read_response()!
 }
diff --git a/request.v b/request.v
index f844717..92d7073 100644
--- a/request.v
+++ b/request.v
@@ -5,17 +5,13 @@ import net.urllib
 import io
 import json
 
-fn (mut d DockerConn) request(method http.Method, url string, params map[string]string) {
+fn (mut d DockerConn) request(method http.Method, url string) {
 	d.method = method
 	d.url = url
 	d.content_type = ''
 	d.body = ''
 
 	d.params.clear()
-
-	for key, value in params {
-		d.params[key] = urllib.query_escape(value.replace("'", '"'))
-	}
 }
 
 fn (mut d DockerConn) body(content_type string, body string) {
@@ -29,11 +25,17 @@ fn (mut d DockerConn) body_json<T>(data T) {
 }
 
 fn (mut d DockerConn) params<T>(o T) {
-	$for field in T.fields {
-		v := o.$(field.name)
+	$if T is map[string]string {
+		for key, value in o {
+			d.params[key] = urllib.query_escape(value.replace("'", '"'))
+		}
+	} $else {
+		$for field in T.fields {
+			v := o.$(field.name)
 
-		if !isnil(v) {
-			d.params[field.name] = urllib.query_escape(v.str().replace("'", '"'))
+			if !isnil(v) {
+				d.params[field.name] = urllib.query_escape(v.str().replace("'", '"'))
+			}
 		}
 	}
 }
diff --git a/volumes.v b/volumes.v
index 8442ef0..be648c8 100644
--- a/volumes.v
+++ b/volumes.v
@@ -17,7 +17,7 @@ struct VolumeListResponse {
 }
 
 pub fn (mut d DockerConn) volume_list() !VolumeListResponse {
-	d.request(.get, '/volumes', {})
+	d.request(.get, '/volumes')
 	d.send()!
 
 	mut data := d.read_json_response<VolumeListResponse>()!