diff --git a/Makefile b/Makefile
index b25f105..7a86c0e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 # =====CONFIG=====
 V_PATH ?= v
-V := $(V_PATH) -showcc
+V := $(V_PATH) -showcc -d use_openssl
 
 all: vdocker
 
@@ -10,6 +10,10 @@ all: vdocker
 vdocker:
 	$(V) -g -shared .
 
+.PHONY: c
+c:
+	$(V) -o docker.c .
+
 
 # =====DOCS=====
 .PHONY: api-docs
diff --git a/ROADMAP.md b/ROADMAP.md
index 52e22a2..648d4c5 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -42,7 +42,7 @@ reference](https://docs.docker.com/engine/api/v1.41/).
     - [ ] Inspect an image
     - [ ] Get the history of an image
     - [ ] Push an image
-    - [ ] Tag an image
+    - [x] Tag an image
     - [ ] Remove an image
     - [ ] Search images
     - [ ] Delete unused images
diff --git a/containers.v b/containers.v
index 809ef38..6981a2c 100644
--- a/containers.v
+++ b/containers.v
@@ -1,8 +1,6 @@
 module docker
 
-import json
 import time
-import net.http { Method }
 import types { ContainerListItem }
 
 [params]
@@ -14,7 +12,7 @@ pub struct ContainerListConfig {
 }
 
 pub fn (mut d DockerConn) container_list(c ContainerListConfig) ![]ContainerListItem {
-	d.get('/containers/json')
+	d.request(.get, '/containers/json')
 	d.params(c)
 	d.send()!
 
@@ -37,30 +35,18 @@ pub:
 }
 
 pub fn (mut d DockerConn) container_create(c NewContainer) !CreatedContainer {
-	d.send_request_with_json(Method.post, '/containers/create', c)!
-	head, res := d.read_response()!
+	d.request(.post, '/containers/create')
+	d.body_json(c)
+	d.send()!
 
-	if head.status_code != 201 {
-		data := json.decode(DockerError, res)!
-
-		return error(data.message)
-	}
-
-	data := json.decode(CreatedContainer, res)!
-
-	return data
+	return d.read_json_response<CreatedContainer>()
 }
 
 // start_container starts the container with the given id.
 pub fn (mut d DockerConn) container_start(id string) ! {
-	d.send_request(Method.post, '/containers/$id/start')!
-	head, body := d.read_response()!
-
-	if head.status_code != 204 {
-		data := json.decode(DockerError, body)!
-
-		return error(data.message)
-	}
+	d.request(.post, '/containers/$id/start')
+	d.send()!
+	d.read_response()!
 }
 
 struct ContainerInspect {
@@ -82,16 +68,10 @@ pub mut:
 }
 
 pub fn (mut d DockerConn) container_inspect(id string) !ContainerInspect {
-	d.send_request(Method.get, '/containers/$id/json')!
-	head, body := d.read_response()!
+	d.request(.get, '/containers/$id/json')
+	d.send()!
 
-	if head.status_code != 200 {
-		data := json.decode(DockerError, body)!
-
-		return error(data.message)
-	}
-
-	mut data := json.decode(ContainerInspect, body)!
+	mut data := d.read_json_response<ContainerInspect>()!
 
 	// The Docker engine API *should* always return UTC time.
 	data.state.start_time = time.parse_rfc3339(data.state.start_time_str)!
@@ -104,27 +84,20 @@ pub fn (mut d DockerConn) container_inspect(id string) !ContainerInspect {
 }
 
 pub fn (mut d DockerConn) container_remove(id string) ! {
-	d.send_request(Method.delete, '/containers/$id')!
-	head, body := d.read_response()!
-
-	if head.status_code != 204 {
-		data := json.decode(DockerError, body)!
-
-		return error(data.message)
-	}
+	d.request(.delete, '/containers/$id')
+	d.send()!
+	d.read_response()!
 }
 
 pub fn (mut d DockerConn) container_get_logs(id string) !&StreamFormatReader {
-	d.send_request(Method.get, '/containers/$id/logs?stdout=true&stderr=true')!
-	head := d.read_response_head()!
-
-	if head.status_code != 200 {
-		content_length := head.header.get(http.CommonHeader.content_length)!.int()
-		body := d.read_response_body(content_length)!
-		data := json.decode(DockerError, body)!
-
-		return error(data.message)
-	}
+	d.request(.get, '/containers/$id/logs')
+	d.params({
+		'stdout': 'true'
+		'stderr': 'true'
+	})
+	d.send()!
+	d.read_response_head()!
+	d.check_error()!
 
 	return d.get_stream_format_reader()
 }
diff --git a/docker.v b/docker.v
index 7eb5ea2..cd30b60 100644
--- a/docker.v
+++ b/docker.v
@@ -4,7 +4,6 @@ import net.unix
 import io
 import net.http
 import strings
-import net.urllib
 import json
 import util
 
@@ -27,7 +26,11 @@ mut:
 	url          string
 	params       map[string]string
 	content_type string
-	body         string
+	// Before send: body of the request
+	// After send: body of response
+	body string
+	// HTTP head of the response
+	head http.Response
 }
 
 // new_conn creates a new connection to the Docker daemon.
@@ -47,113 +50,71 @@ pub fn (mut d DockerConn) close() ! {
 	d.socket.close()!
 }
 
-// send_request sends an HTTP request without body.
-fn (mut d DockerConn) send_request(method http.Method, url_str string) ! {
-	url := urllib.parse('/$docker.api_version$url_str')!
-	req := '$method $url.request_uri() HTTP/1.1\nHost: localhost\n\n'
-
-	d.socket.write_string(req)!
-
-	// When starting a new request, the reader needs to be reset.
-	d.reader = io.new_buffered_reader(reader: d.socket)
-}
-
-// send_request_with_body sends an HTTP request with the given body.
-fn (mut d DockerConn) send_request_with_body(method http.Method, url_str string, content_type string, body string) ! {
-	url := urllib.parse('/$docker.api_version$url_str')!
-	req := '$method $url.request_uri() HTTP/1.1\nHost: localhost\nContent-Type: $content_type\nContent-Length: $body.len\n\n$body\n\n'
-
-	d.socket.write_string(req)!
-
-	// When starting a new request, the reader needs to be reset.
-	d.reader = io.new_buffered_reader(reader: d.socket)
-}
-
-// send_request_with_json<T> is a convenience wrapper around
-// send_request_with_body that encodes the input as JSON.
-fn (mut d DockerConn) send_request_with_json<T>(method http.Method, url_str string, data &T) ! {
-	body := json.encode(data)
-
-	return d.send_request_with_body(method, url_str, 'application/json', body)
-}
-
 // read_response_head consumes the socket's contents until it encounters
 // '\r\n\r\n', after which it parses the response as an HTTP response.
 // Importantly, this function never consumes the reader past the HTTP
 // separator, so the body can be read fully later on.
-fn (mut d DockerConn) read_response_head() !http.Response {
+fn (mut d DockerConn) read_response_head() ! {
 	mut res := []u8{}
 
 	util.read_until_separator(mut d.reader, mut res, docker.http_separator)!
 
-	return http.parse_response(res.bytestr())
+	d.head = http.parse_response(res.bytestr())!
 }
 
-// read_response_body reads `length` bytes from the stream. It can be used when
-// the response encoding isn't chunked to fully read it.
-fn (mut d DockerConn) read_response_body(length int) !string {
-	if length == 0 {
-		return ''
+// read_response_body consumes the rest of the HTTP response and stores it as
+// the response body. This function should only be called after
+// read_response_head. This function always reads the entire response into
+// memory, even if it's chunked.
+fn (mut d DockerConn) read_response_body() ! {
+	if d.head.status() == .no_content {
+		return
 	}
 
-	mut buf := []u8{len: docker.buf_len}
-	mut c := 0
 	mut builder := strings.new_builder(docker.buf_len)
 
-	for builder.len < length {
-		c = d.reader.read(mut buf) or { break }
+	if d.head.header.get(.transfer_encoding) or { '' } == 'chunked' {
+		mut body_stream := d.get_chunked_response_reader()
 
-		builder.write(buf[..c])!
+		util.reader_to_writer(mut body_stream, mut builder)!
+	} else {
+		content_length := d.head.header.get(.content_length)!.int()
+
+		if content_length == 0 {
+            d.body = ''
+
+			return
+		}
+
+		mut buf := []u8{len: docker.buf_len}
+		mut c := 0
+
+		for builder.len < content_length {
+			c = d.reader.read(mut buf)!
+
+			builder.write(buf[..c])!
+		}
 	}
 
-	return builder.str()
+	d.body = builder.str()
 }
 
-// read_response is a convenience function which always consumes the entire
-// response & returns it. It should only be used when we're certain that the
-// result isn't too large.
-fn (mut d DockerConn) read_response() !(http.Response, string) {
-	head := d.read_response_head()!
-
-	if head.status().is_error() {
-		content_length := head.header.get(.content_length)!.int()
-		body := d.read_response_body(content_length)!
-		mut err := json.decode(DockerError, body)!
-		err.status = head.status_code
-
-		return err
-	}
-
-	// 204 means "No Content", so we can assume nothing follows after this
-	if head.status() == .no_content {
-		return head, ''
-	}
-
-	if head.header.get(http.CommonHeader.transfer_encoding) or { '' } == 'chunked' {
-		mut builder := strings.new_builder(1024)
-		mut body := d.get_chunked_response_reader()
-
-		util.reader_to_writer(mut body, mut builder)!
-
-		return head, builder.str()
-	}
-
-	content_length := head.header.get(http.CommonHeader.content_length)!.int()
-	body := d.read_response_body(content_length)!
-
-	return head, body
+// read_response is a convenience function that always consumes the entire
+// response and loads it into memory. It should only be used when we're certain
+// that the result isn't too large, as even chunked responses will get fully
+// loaded into memory.
+fn (mut d DockerConn) read_response() ! {
+	d.read_response_head()!
+	d.check_error()!
+	d.read_response_body()!
 }
 
+// read_json_response<T> is a convenience function that runs read_response
+// before parsing its contents, which is assumed to be JSON, into a struct.
 fn (mut d DockerConn) read_json_response<T>() !T {
-	head, body := d.read_response()!
+	d.read_response()!
 
-	if head.status_code < 200 || head.status_code > 300 {
-		data := json.decode(DockerError, body)!
-
-		return docker_error(head.status_code, data.message)
-	}
-
-	mut data := json.decode(T, body)!
+	data := json.decode(T, d.body)!
 
 	//$for field in T.fields {
 	//$if field.typ is time.Time {
@@ -165,7 +126,7 @@ fn (mut d DockerConn) read_json_response<T>() !T {
 }
 
 // get_chunked_response_reader returns a ChunkedResponseReader using the socket
-// as reader.
+// as reader. This function should only be called after check_error.
 fn (mut d DockerConn) get_chunked_response_reader() &ChunkedResponseReader {
 	r := new_chunked_response_reader(d.reader)
 
@@ -173,10 +134,28 @@ fn (mut d DockerConn) get_chunked_response_reader() &ChunkedResponseReader {
 }
 
 // get_stream_format_reader returns a StreamFormatReader using the socket as
-// reader.
+// reader. This function should only be called after check_error.
 fn (mut d DockerConn) get_stream_format_reader() &StreamFormatReader {
 	r := new_chunked_response_reader(d.reader)
 	r2 := new_stream_format_reader(r)
 
 	return r2
 }
+
+struct DockerError {
+pub:
+	message string
+}
+
+// check_error should be called after read_response_head. If the status code of
+// the response is an error, the body is consumed and the Docker HTTP error is
+// returned as a V error. If the status isn't the error, this function is a
+// no-op, and the body can be read.
+fn (mut d DockerConn) check_error() ! {
+	if d.head.status().is_error() {
+		d.read_response_body()!
+		d_err := json.decode(DockerError, d.body)!
+
+		return error_with_code('$d.head.status(): $d_err.message', d.head.status_code)
+	}
+}
diff --git a/errors.v b/errors.v
deleted file mode 100644
index 31ed81a..0000000
--- a/errors.v
+++ /dev/null
@@ -1,22 +0,0 @@
-module docker
-
-struct DockerError {
-pub mut:
-	status  int    [skip]
-	message string
-}
-
-fn (err DockerError) code() int {
-	return err.status
-}
-
-fn (err DockerError) msg() string {
-	return err.message
-}
-
-fn docker_error(status int, message string) DockerError {
-	return DockerError{
-		status: status
-		message: message
-	}
-}
diff --git a/images.v b/images.v
index a6f2a23..76df20d 100644
--- a/images.v
+++ b/images.v
@@ -1,31 +1,26 @@
 module docker
 
-import net.http { Method }
 import types { Image }
-import json
 
 pub fn (mut d DockerConn) image_inspect(image string) !Image {
-	d.send_request(.get, '/images/$image/json')!
-	_, body := d.read_response()!
+	d.request(.get, '/images/$image/json')
+	d.send()!
 
-	data := json.decode(Image, body)!
+	data := d.read_json_response<Image>()!
 
 	return data
 }
 
-// pull_image pulls the given image:tag.
-pub fn (mut d DockerConn) pull_image(image string, tag string) ! {
-	d.send_request(Method.post, '/images/create?fromImage=$image&tag=$tag')!
-	head := d.read_response_head()!
-
-	if head.status().is_error() {
-		content_length := head.header.get(.content_length)!.int()
-		body := d.read_response_body(content_length)!
-		mut err := json.decode(DockerError, body)!
-		err.status = head.status_code
-
-		return err
-	}
+// image_pull pulls the given image:tag.
+pub fn (mut d DockerConn) image_pull(image string, tag string) ! {
+	d.request(.post, '/images/create')
+	d.params({
+		'fromImage': image
+		'tag':       tag
+	})
+	d.send()!
+	d.read_response_head()!
+	d.check_error()!
 
 	// Keep reading the body until the pull has completed
 	mut body := d.get_chunked_response_reader()
@@ -38,17 +33,31 @@ pub fn (mut d DockerConn) pull_image(image string, tag string) ! {
 }
 
 // create_image_from_container creates a new image from a container.
-pub fn (mut d DockerConn) create_image_from_container(id string, repo string, tag string) !Image {
-	d.send_request(.post, '/commit?container=$id&repo=$repo&tag=$tag')!
-	_, body := d.read_response()!
+pub fn (mut d DockerConn) image_from_container(id string, repo string, tag string) !Image {
+	d.request(.post, '/commit')
+	d.params({
+		'container': id
+		'repo':      repo
+		'tag':       tag
+	})
+	d.send()!
 
-	data := json.decode(Image, body)!
-
-	return data
+	return d.read_json_response<Image>()!
 }
 
 // remove_image removes the image with the given id.
-pub fn (mut d DockerConn) remove_image(id string) ! {
-	d.send_request(.delete, '/images/$id')!
+pub fn (mut d DockerConn) image_remove(id string) ! {
+	d.request(.delete, '/images/$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')
+	d.params({
+		'repo': repo
+		'tag':  tag
+	})
+	d.send()!
 	d.read_response()!
 }
diff --git a/request.v b/request.v
index fdee0d4..92d7073 100644
--- a/request.v
+++ b/request.v
@@ -3,25 +3,39 @@ module docker
 import net.http
 import net.urllib
 import io
+import json
 
-fn (mut d DockerConn) request(method http.Method, url_str string) {
+fn (mut d DockerConn) request(method http.Method, url string) {
 	d.method = method
-	d.url = url_str
-	d.params.clear()
+	d.url = url
 	d.content_type = ''
 	d.body = ''
+
+	d.params.clear()
 }
 
-fn (mut d DockerConn) get(url_str string) {
-	d.request(http.Method.get, url_str)
+fn (mut d DockerConn) body(content_type string, body string) {
+	d.content_type = content_type
+	d.body = body
+}
+
+fn (mut d DockerConn) body_json<T>(data T) {
+	d.content_type = 'application/json'
+	d.body = json.encode(data)
 }
 
 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/types/volume.v b/types/volume.v
new file mode 100644
index 0000000..14bc012
--- /dev/null
+++ b/types/volume.v
@@ -0,0 +1,22 @@
+module types
+
+import time
+
+pub struct UsageData {
+	size      int [json: Size]
+	ref_count int [json: RefCount]
+}
+
+pub struct Volume {
+pub mut:
+	created_at_str string            [json: CreatedAt]
+	created_at     time.Time         [skip]
+	name           string            [json: Name]
+	driver         string            [json: Driver]
+	mountpoint     string            [json: Mountpoint]
+	status         map[string]string [json: Status]
+	labels         map[string]string [json: Labels]
+	scope          string            [json: Scope]
+	options        map[string]string [json: Options]
+	usage_data     UsageData         [json: UsageData]
+}
diff --git a/volumes.v b/volumes.v
index 5bd9936..be648c8 100644
--- a/volumes.v
+++ b/volumes.v
@@ -1,26 +1,7 @@
 module docker
 
-import net.http { Method }
 import time
-
-struct UsageData {
-	size      int [json: Size]
-	ref_count int [json: RefCount]
-}
-
-struct Volume {
-	created_at_str string [json: CreatedAt]
-pub mut:
-	created_at time.Time         [skip]
-	name       string            [json: Name]
-	driver     string            [json: Driver]
-	mountpoint string            [json: Mountpoint]
-	status     map[string]string [json: Status]
-	labels     map[string]string [json: Labels]
-	scope      string            [json: Scope]
-	options    map[string]string [json: Options]
-	usage_data UsageData         [json: UsageData]
-}
+import types { Volume }
 
 [params]
 pub struct VolumeListFilter {
@@ -36,7 +17,8 @@ struct VolumeListResponse {
 }
 
 pub fn (mut d DockerConn) volume_list() !VolumeListResponse {
-	d.send_request(Method.get, '/volumes')!
+	d.request(.get, '/volumes')
+	d.send()!
 
 	mut data := d.read_json_response<VolumeListResponse>()!