diff --git a/writeas.go b/writeas.go
index 1a646e7..fa87ae1 100644
--- a/writeas.go
+++ b/writeas.go
@@ -1,199 +1,199 @@
 // Package writeas provides the binding for the Write.as API
 package writeas
 
 import (
 	"bytes"
 	"encoding/json"
 	"fmt"
 	"io"
 	"net/http"
 	"time"
 
 	"code.as/core/socks"
 	"github.com/writeas/impart"
 )
 
 const (
 	apiURL    = "https://write.as/api"
 	devAPIURL = "https://development.write.as/api"
 	torAPIURL = "http://writeas7pm7rcdqg.onion/api"
 
 	// Current go-writeas version
 	Version = "2-dev"
 )
 
 // Client is used to interact with the Write.as API. It can be used to make
 // authenticated or unauthenticated calls.
 type Client struct {
 	baseURL string
 
 	// Access token for the user making requests.
 	token string
 	// Client making requests to the API
 	client *http.Client
 
 	// UserAgent overrides the default User-Agent header
 	UserAgent string
 }
 
 // defaultHTTPTimeout is the default http.Client timeout.
 const defaultHTTPTimeout = 10 * time.Second
 
 // NewClient creates a new API client. By default, all requests are made
 // unauthenticated. To optionally make authenticated requests, call `SetToken`.
 //
 //     c := writeas.NewClient()
 //     c.SetToken("00000000-0000-0000-0000-000000000000")
 func NewClient() *Client {
 	return NewClientWith(Config{URL: apiURL})
 }
 
 // NewTorClient creates a new API client for communicating with the Write.as
 // Tor hidden service, using the given port to connect to the local SOCKS
 // proxy.
 func NewTorClient(port int) *Client {
 	return NewClientWith(Config{URL: torAPIURL, TorPort: port})
 }
 
 // NewDevClient creates a new API client for development and testing. It'll
 // communicate with our development servers, and SHOULD NOT be used in
 // production.
 func NewDevClient() *Client {
 	return NewClientWith(Config{URL: devAPIURL})
 }
 
 // Config configures a Write.as client.
 type Config struct {
 	// URL of the Write.as API service. Defaults to https://write.as/api.
 	URL string
 
 	// If specified, the API client will communicate with the Write.as Tor
 	// hidden service using the provided port to connect to the local SOCKS
 	// proxy.
 	TorPort int
 
 	// If specified, requests will be authenticated using this user token.
 	// This may be provided after making a few anonymous requests with
 	// SetToken.
 	Token string
 }
 
 // NewClientWith builds a new API client with the provided configuration.
 func NewClientWith(c Config) *Client {
 	if c.URL == "" {
 		c.URL = apiURL
 	}
 
 	httpClient := &http.Client{Timeout: defaultHTTPTimeout}
 	if c.TorPort > 0 {
 		dialSocksProxy := socks.DialSocksProxy(socks.SOCKS5, fmt.Sprintf("127.0.0.1:%d", c.TorPort))
 		httpClient.Transport = &http.Transport{Dial: dialSocksProxy}
 	}
 
 	return &Client{
 		client:  httpClient,
 		baseURL: c.URL,
 		token:   c.Token,
 	}
 }
 
 // SetToken sets the user token for all future Client requests. Setting this to
 // an empty string will change back to unauthenticated requests.
 func (c *Client) SetToken(token string) {
 	c.token = token
 }
 
 // Token returns the user token currently set to the Client.
 func (c *Client) Token() string {
 	return c.token
 }
 
 func (c *Client) get(path string, r interface{}) (*impart.Envelope, error) {
 	method := "GET"
 	if method != "GET" && method != "HEAD" {
 		return nil, fmt.Errorf("Method %s not currently supported by library (only HEAD and GET).\n", method)
 	}
 
 	return c.request(method, path, nil, r)
 }
 
 func (c *Client) post(path string, data, r interface{}) (*impart.Envelope, error) {
 	b := new(bytes.Buffer)
 	json.NewEncoder(b).Encode(data)
 	return c.request("POST", path, b, r)
 }
 
 func (c *Client) put(path string, data, r interface{}) (*impart.Envelope, error) {
 	b := new(bytes.Buffer)
 	json.NewEncoder(b).Encode(data)
 	return c.request("PUT", path, b, r)
 }
 
 func (c *Client) delete(path string, data map[string]string) (*impart.Envelope, error) {
 	r, err := c.buildRequest("DELETE", path, nil)
 	if err != nil {
 		return nil, err
 	}
 
 	q := r.URL.Query()
 	for k, v := range data {
 		q.Add(k, v)
 	}
 	r.URL.RawQuery = q.Encode()
 
 	return c.doRequest(r, nil)
 }
 
 func (c *Client) request(method, path string, data io.Reader, result interface{}) (*impart.Envelope, error) {
 	r, err := c.buildRequest(method, path, data)
 	if err != nil {
 		return nil, err
 	}
 
 	return c.doRequest(r, result)
 }
 
 func (c *Client) buildRequest(method, path string, data io.Reader) (*http.Request, error) {
 	url := fmt.Sprintf("%s%s", c.baseURL, path)
 	r, err := http.NewRequest(method, url, data)
 	if err != nil {
 		return nil, fmt.Errorf("Create request: %v", err)
 	}
 	c.prepareRequest(r)
 
 	return r, nil
 }
 
 func (c *Client) doRequest(r *http.Request, result interface{}) (*impart.Envelope, error) {
 	resp, err := c.client.Do(r)
 	if err != nil {
 		return nil, fmt.Errorf("Request: %v", err)
 	}
 	defer resp.Body.Close()
 
 	env := &impart.Envelope{
 		Code: resp.StatusCode,
 	}
 	if result != nil {
 		env.Data = result
 
 		err = json.NewDecoder(resp.Body).Decode(&env)
 		if err != nil {
 			return nil, err
 		}
 	}
 
 	return env, nil
 }
 
 func (c *Client) prepareRequest(r *http.Request) {
 	ua := c.UserAgent
 	if ua == "" {
 		ua = "go-writeas v" + Version
 	}
-	r.Header.Add("User-Agent", ua)
+	r.Header.Set("User-Agent", ua)
 	r.Header.Add("Content-Type", "application/json")
 	if c.token != "" {
 		r.Header.Add("Authorization", "Token "+c.token)
 	}
 }