diff --git a/.travis.yml b/.travis.yml
index feb3f90..de0cbd7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,21 +3,20 @@ language: go
 services:
   - docker
 
-dist: trusty
+dist: focal
 
 go:
-  - 1.12.x
-  - 1.11.x
+  - "1.12"
+  - "1.13"
+  # - "1.14"
 
 env:
   global:
     - GOLANG_VERSION="${TRAVIS_GO_VERSION}"
     - IMAGINARY_VERSION="${TRAVIS_TAG:-dev}"
   matrix:
-    - LIBVIPS=8.7.3
-    - LIBVIPS=8.7.4
-    - LIBVIPS=8.8.0
-    - LIBVIPS=8.8.1
+    - LIBVIPS=8.8.4
+    - LIBVIPS=8.9.2
 
 before_install:
   - docker pull h2non/imaginary:latest || true
@@ -28,14 +27,14 @@ install:
 script:
   - docker build --pull --cache-from h2non/imaginary:latest --build-arg GOLANG_VERSION="${GOLANG_VERSION%.x}" --build-arg LIBVIPS_VERSION="${LIBVIPS}" --build-arg IMAGINARY_VERSION="${IMAGINARY_VERSION#v}" --tag h2non/imaginary:${IMAGINARY_VERSION} .
 
-# before_deploy:
-#  - docker login -u "$REGISTRY_USER" -p "$REGISTRY_PASS"
+before_deploy:
+  - docker login -u "$DOCKER_LOGIN" -p "$DOCKER_PWD"
 
-# deploy:
-#  provider: script
-#  script:
-#    - docker tag h2non/imaginary:${IMAGINARY_VERSION} latest
-#    - docker push h2non/imaginary:${IMAGINARY_VERSION}
-#    - docker push h2non/imaginary:latest
-#  on:
-#    condition: "${TRAVIS_TAG} =~ ^v([0-9]+)\.([0-9]+)\.([0-9]+)$"
+deploy:
+  provider: script
+  script:
+    - docker tag h2non/imaginary:${IMAGINARY_VERSION} h2non/imaginary:latest
+    - docker push h2non/imaginary:${IMAGINARY_VERSION}
+    - docker push h2non/imaginary:latest
+  on:
+    condition: "${TRAVIS_TAG} =~ ^v([0-9]+).([0-9]+).([0-9]+)$ AND env(GOLANG_VERSION) = 1.13"
diff --git a/Dockerfile b/Dockerfile
index 6d63734..d516c3c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,8 @@
-ARG GOLANG_VERSION=1.13.7
+ARG GOLANG_VERSION=1.14
 FROM golang:${GOLANG_VERSION} as builder
 
 ARG IMAGINARY_VERSION=dev
-ARG LIBVIPS_VERSION=8.9.1
+ARG LIBVIPS_VERSION=8.9.2
 ARG GOLANGCILINT_VERSION=1.23.3
 
 # Installs libvips + required libraries
@@ -50,8 +50,8 @@ RUN go mod download
 COPY . .
 
 # Run quality control
-RUN go test -test.v -test.race -test.covermode=atomic ./...
-RUN golangci-lint run ./...
+RUN go test -test.v -test.race -test.covermode=atomic .
+RUN golangci-lint run .
 
 # Compile imaginary
 RUN go build -a \
diff --git a/README.md b/README.md
index 9edaf4f..6c35563 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# imaginary [![Build Status](https://travis-ci.org/h2non/imaginary.png)](https://travis-ci.org/h2non/imaginary) [![Docker](https://img.shields.io/badge/docker-h2non/imaginary-blue.svg)](https://hub.docker.com/r/h2non/imaginary/) [![Docker Registry](https://img.shields.io/docker/pulls/h2non/imaginary.svg)](https://hub.docker.com/r/h2non/imaginary/) [![Go Report Card](http://goreportcard.com/badge/h2non/imaginary)](https://goreportcard.com/report/h2non/imaginary) [![Fly.io](https://img.shields.io/badge/deploy-fly.io-blue.svg)](https://fly.io/launch/github/h2non/imaginary)
+# imaginary [![Build Status](https://travis-ci.org/h2non/imaginary.svg)](https://travis-ci.org/h2non/imaginary) [![Docker](https://img.shields.io/badge/docker-h2non/imaginary-blue.svg)](https://hub.docker.com/r/h2non/imaginary/) [![Docker Registry](https://img.shields.io/docker/pulls/h2non/imaginary.svg)](https://hub.docker.com/r/h2non/imaginary/) [![Go Report Card](http://goreportcard.com/badge/h2non/imaginary)](https://goreportcard.com/report/h2non/imaginary) [![Fly.io](https://img.shields.io/badge/deploy-fly.io-blue.svg)](https://fly.io/launch/github/h2non/imaginary)
 
 **[Fast](#benchmarks) HTTP [microservice](http://microservices.io/patterns/microservices.html)** written in Go **for high-level image processing** backed by [bimg](https://github.com/h2non/bimg) and [libvips](https://github.com/jcupitt/libvips). `imaginary` can be used as private or public HTTP service for massive image processing with first-class support for [Docker](#docker) & [Fly.io](#flyio).
 It's almost dependency-free and only uses [`net/http`](http://golang.org/pkg/net/http/) native package without additional abstractions for better [performance](#performance).
@@ -83,7 +83,7 @@ go get -u github.com/h2non/imaginary
 
 Also, be sure you have the latest version of `bimg`:
 ```bash
-go get -u gopkg.in/h2non/bimg.v1
+go get -u github.com/h2non/bimg
 ```
 
 ### libvips
@@ -553,7 +553,7 @@ Image measures are always in pixels, unless otherwise indicated.
 - **url**         `string` - Fetch the image from a remote HTTP server. In order to use this you must pass the `-enable-url-source` flag.
 - **colorspace**  `string` - Use a custom color space for the output image. Allowed values are: `srgb` or `bw` (black&white)
 - **field**       `string` - Custom image form field name if using `multipart/form`. Defaults to: `file`
-- **extend**      `string` - Extend represents the image extend mode used when the edges of an image are extended. Allowed values are: `black`, `copy`, `mirror`, `white` and `background`. If `background` value is specified, you can define the desired extend RGB color via `background` param, such as `?extend=background&background=250,20,10`. For more info, see [libvips docs](http://www.vips.ecs.soton.ac.uk/supported/8.4/doc/html/libvips/libvips-conversion.html#VIPS-EXTEND-BACKGROUND:CAPS).
+- **extend**      `string` - Extend represents the image extend mode used when the edges of an image are extended. Defaults to `copy`. Allowed values are: `black`, `copy`, `mirror`, `white`, `lastpixel` and `background`. If `background` value is specified, you can define the desired extend RGB color via `background` param, such as `?extend=background&background=250,20,10`. For more info, see [libvips docs](http://www.vips.ecs.soton.ac.uk/supported/8.4/doc/html/libvips/libvips-conversion.html#VIPS-EXTEND-BACKGROUND:CAPS).
 - **background**  `string` - Background RGB decimal base color to use when flattening transparent PNGs. Example: `255,200,150`
 - **sigma**       `float`  - Size of the gaussian mask to use when blurring an image. Example: `15.0`
 - **minampl**     `float`  - Minimum amplitude of the gaussian filter to use when blurring an image. Default: Example: `0.5`
diff --git a/controllers.go b/controllers.go
index df21faa..084f957 100644
--- a/controllers.go
+++ b/controllers.go
@@ -44,7 +44,11 @@ func imageController(o ServerOptions, operation Operation) func(http.ResponseWri
 
 		buf, err := imageSource.GetImage(req)
 		if err != nil {
-			ErrorReply(req, w, NewError(err.Error(), BadRequest), o)
+			if xerr, ok := err.(Error); ok {
+				ErrorReply(req, w, xerr, o)
+			} else {
+				ErrorReply(req, w, NewError(err.Error(), http.StatusBadRequest), o)
+			}
 			return
 		}
 
@@ -100,7 +104,7 @@ func imageHandler(w http.ResponseWriter, r *http.Request, buf []byte, operation
 
 	opts, err := buildParamsFromQuery(r.URL.Query())
 	if err != nil {
-		ErrorReply(r, w, NewError("Error while processing parameters, "+err.Error(), BadRequest), o)
+		ErrorReply(r, w, NewError("Error while processing parameters, "+err.Error(), http.StatusBadRequest), o)
 		return
 	}
 
@@ -115,7 +119,7 @@ func imageHandler(w http.ResponseWriter, r *http.Request, buf []byte, operation
 
 	image, err := operation.Run(buf, opts)
 	if err != nil {
-		ErrorReply(r, w, NewError("Error while processing the image: "+err.Error(), BadRequest), o)
+		ErrorReply(r, w, NewError("Error while processing the image: "+err.Error(), http.StatusBadRequest), o)
 		return
 	}
 
diff --git a/error.go b/error.go
index f3d029a..d866e54 100644
--- a/error.go
+++ b/error.go
@@ -9,38 +9,26 @@ import (
 	"github.com/h2non/bimg"
 )
 
-const (
-	_ uint8 = iota
-	BadRequest
-	NotAllowed
-	Unsupported
-	Unauthorized
-	InternalError
-	NotFound
-	NotImplemented
-	Forbidden
-	NotAcceptable
-)
-
 var (
-	ErrNotFound             = NewError("not found", NotFound)
-	ErrInvalidAPIKey        = NewError("invalid or missing API key", Unauthorized)
-	ErrMethodNotAllowed     = NewError("method not allowed", NotAllowed)
-	ErrUnsupportedMedia     = NewError("unsupported media type", Unsupported)
-	ErrOutputFormat         = NewError("unsupported output image format", BadRequest)
-	ErrEmptyBody            = NewError("empty image", BadRequest)
-	ErrMissingParamFile     = NewError("missing required param: file", BadRequest)
-	ErrInvalidFilePath      = NewError("invalid file path", BadRequest)
-	ErrInvalidImageURL      = NewError("invalid image URL", BadRequest)
-	ErrMissingImageSource   = NewError("cannot process the image due to missing or invalid params", BadRequest)
-	ErrNotImplemented       = NewError("not implemented endpoint", NotImplemented)
-	ErrInvalidURLSignature  = NewError("invalid URL signature", BadRequest)
-	ErrURLSignatureMismatch = NewError("URL signature mismatch", Forbidden)
+	ErrNotFound             = NewError("Not found", http.StatusNotFound)
+	ErrInvalidAPIKey        = NewError("Invalid or missing API key", http.StatusUnauthorized)
+	ErrMethodNotAllowed     = NewError("HTTP method not allowed. Try with a POST or GET method (-enable-url-source flag must be defined)", http.StatusMethodNotAllowed)
+	ErrGetMethodNotAllowed  = NewError("GET method not allowed. Make sure remote URL source is enabled by using the flag: -enable-url-source", http.StatusMethodNotAllowed)
+	ErrUnsupportedMedia     = NewError("Unsupported media type", http.StatusNotAcceptable)
+	ErrOutputFormat         = NewError("Unsupported output image format", http.StatusBadRequest)
+	ErrEmptyBody            = NewError("Empty or unreadable image", http.StatusBadRequest)
+	ErrMissingParamFile     = NewError("Missing required param: file", http.StatusBadRequest)
+	ErrInvalidFilePath      = NewError("Invalid file path", http.StatusBadRequest)
+	ErrInvalidImageURL      = NewError("Unvalid image URL", http.StatusBadRequest)
+	ErrMissingImageSource   = NewError("Cannot process the image due to missing or invalid params", http.StatusBadRequest)
+	ErrNotImplemented       = NewError("Not implemented endpoint", http.StatusNotImplemented)
+	ErrInvalidURLSignature  = NewError("Invalid URL signature", http.StatusBadRequest)
+	ErrURLSignatureMismatch = NewError("URL signature mismatch", http.StatusForbidden)
 )
 
 type Error struct {
 	Message string `json:"message,omitempty"`
-	Code    uint8  `json:"code"`
+	Code    int    `json:"status"`
 }
 
 func (e Error) JSON() []byte {
@@ -53,34 +41,21 @@ func (e Error) Error() string {
 }
 
 func (e Error) HTTPCode() int {
-	var codes = map[uint8]int{
-		BadRequest:     http.StatusBadRequest,
-		NotAllowed:     http.StatusMethodNotAllowed,
-		Unsupported:    http.StatusUnsupportedMediaType,
-		InternalError:  http.StatusInternalServerError,
-		Unauthorized:   http.StatusUnauthorized,
-		NotFound:       http.StatusNotFound,
-		NotImplemented: http.StatusNotImplemented,
-		Forbidden:      http.StatusForbidden,
-		NotAcceptable:  http.StatusNotAcceptable,
+	if e.Code >= 400 && e.Code <= 511 {
+		return e.Code
 	}
-
-	if v, ok := codes[e.Code]; ok {
-		return v
-	}
-
 	return http.StatusServiceUnavailable
 }
 
-func NewError(err string, code uint8) Error {
+func NewError(err string, code int) Error {
 	err = strings.Replace(err, "\n", "", -1)
-	return Error{err, code}
+	return Error{Message: err, Code: code}
 }
 
-func sendErrorResponse(w http.ResponseWriter, httpStatusCode int, imaginaryErrorCode uint8, err error) {
+func sendErrorResponse(w http.ResponseWriter, httpStatusCode int, err error) {
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(httpStatusCode)
-	_, _ = w.Write([]byte(fmt.Sprintf("{\"error\":\"%s\", \"code\": %d}", err.Error(), imaginaryErrorCode)))
+	_, _ = w.Write([]byte(fmt.Sprintf("{\"error\":\"%s\", \"status\": %d}", err.Error(), httpStatusCode)))
 }
 
 func replyWithPlaceholder(req *http.Request, w http.ResponseWriter, errCaller Error, o ServerOptions) error {
@@ -94,20 +69,20 @@ func replyWithPlaceholder(req *http.Request, w http.ResponseWriter, errCaller Er
 
 	bimgOptions.Width, err = parseInt(req.URL.Query().Get("width"))
 	if err != nil {
-		sendErrorResponse(w, http.StatusBadRequest, BadRequest, err)
+		sendErrorResponse(w, http.StatusBadRequest, err)
 		return err
 	}
 
 	bimgOptions.Height, err = parseInt(req.URL.Query().Get("height"))
 	if err != nil {
-		sendErrorResponse(w, http.StatusBadRequest, BadRequest, err)
+		sendErrorResponse(w, http.StatusBadRequest, err)
 		return err
 	}
 
 	// Resize placeholder to expected output
 	buf, err := bimg.Resize(o.PlaceholderImage, bimgOptions)
 	if err != nil {
-		sendErrorResponse(w, http.StatusBadRequest, BadRequest, err)
+		sendErrorResponse(w, http.StatusBadRequest, err)
 		return err
 	}
 
diff --git a/error_test.go b/error_test.go
index e89e37f..8830295 100644
--- a/error_test.go
+++ b/error_test.go
@@ -2,23 +2,23 @@ package main
 
 import "testing"
 
-func TestError(t *testing.T) {
-	err := NewError("oops!\n\n", 1)
+func TestDefaultError(t *testing.T) {
+	err := NewError("oops!\n\n", 503)
 
 	if err.Error() != "oops!" {
 		t.Fatal("Invalid error message")
 	}
-	if err.Code != 1 {
+	if err.Code != 503 {
 		t.Fatal("Invalid error code")
 	}
 
 	code := err.HTTPCode()
-	if code != 400 {
+	if code != 503 {
 		t.Fatalf("Invalid HTTP error status: %d", code)
 	}
 
 	json := string(err.JSON())
-	if json != "{\"message\":\"oops!\",\"code\":1}" {
+	if json != "{\"message\":\"oops!\",\"status\":503}" {
 		t.Fatalf("Invalid JSON output: %s", json)
 	}
 }
diff --git a/go.mod b/go.mod
index 5e73a46..8bb9acf 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@ require (
 	github.com/garyburd/redigo v1.6.0 // indirect
 	github.com/hashicorp/golang-lru v0.0.0-20160813221303-0a025b7e63ad // indirect
 	github.com/rs/cors v0.0.0-20170727213201-7af7a1e09ba3
-	github.com/h2non/bimg v1.0.20-0.20200405220655-daafbf6d972d
-	github.com/h2non/filetype v1.0.12
+	github.com/h2non/bimg v1.1.0
+	github.com/h2non/filetype v1.1.0
 	gopkg.in/throttled/throttled.v2 v2.0.3
 )
diff --git a/go.sum b/go.sum
index f02cdcb..1a085f4 100644
--- a/go.sum
+++ b/go.sum
@@ -1,12 +1,10 @@
-github.com/garyburd/redigo v1.6.0 h1:0VruCpn7yAIIu7pWVClQC8wxCJEcG3nyzpMSHKi1PQc=
 github.com/garyburd/redigo v1.6.0/go.mod h1:NR3MbYisc3/PwhQ00EMzDiPmrwpPxAn5GI05/YaO1SY=
+github.com/h2non/bimg v1.1.0/go.mod h1:R3+UiYwkK4rQl6KVFTOFJHitgLbZXBZNFh2cv3AEbp8=
+github.com/h2non/filetype v1.1.0 h1:Or/gjocJrJRNK/Cri/TDEKFjAR+cfG6eK65NGYB6gBA=
+github.com/h2non/filetype v1.1.0/go.mod h1:319b3zT68BvV+WRj7cwy856M2ehB3HqNOt6sy1HndBY=
 github.com/hashicorp/golang-lru v0.0.0-20160813221303-0a025b7e63ad h1:eMxs9EL0PvIGS9TTtxg4R+JxuPGav82J8rA+GFnY7po=
 github.com/hashicorp/golang-lru v0.0.0-20160813221303-0a025b7e63ad/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
 github.com/rs/cors v0.0.0-20170727213201-7af7a1e09ba3 h1:86ukAHRTa2CXdBnWJHcjjPPGTyLGEF488OFRsbBAuFs=
 github.com/rs/cors v0.0.0-20170727213201-7af7a1e09ba3/go.mod h1:gFx+x8UowdsKA9AchylcLynDq+nNFfI8FkUZdN/jGCU=
-github.com/h2non/bimg v1.0.20-0.20200405220655-daafbf6d972d h1:AhGp7Xiew8DAYGJ1MojrE11chxHVOv4NvE/y5i2IvBI=
-github.com/h2non/bimg v1.0.20-0.20200405220655-daafbf6d972d/go.mod h1:R3+UiYwkK4rQl6KVFTOFJHitgLbZXBZNFh2cv3AEbp8=
-github.com/h2non/filetype v1.0.12 h1:yHCsIe0y2cvbDARtJhGBTD2ecvqMSTvlIcph9En/Zao=
-github.com/h2non/filetype v1.0.12/go.mod h1:319b3zT68BvV+WRj7cwy856M2ehB3HqNOt6sy1HndBY=
 gopkg.in/throttled/throttled.v2 v2.0.3 h1:PGm7nfjjexecEyI2knw1akeLcrjzqxuYSU9a04R8rfU=
 gopkg.in/throttled/throttled.v2 v2.0.3/go.mod h1:L4cTNZO77XKEXtn8HNFRCMNGZPtRRKAhyuJBSvK/T90=
diff --git a/image.go b/image.go
index b4d40d3..e70d249 100644
--- a/image.go
+++ b/image.go
@@ -65,7 +65,7 @@ func Info(buf []byte, o ImageOptions) (Image, error) {
 
 	meta, err := bimg.Metadata(buf)
 	if err != nil {
-		return image, NewError("Cannot retrieve image metadata: %s"+err.Error(), BadRequest)
+		return image, NewError("Cannot retrieve image metadata: %s"+err.Error(), http.StatusBadRequest)
 	}
 
 	info := ImageInfo{
@@ -87,7 +87,7 @@ func Info(buf []byte, o ImageOptions) (Image, error) {
 
 func Resize(buf []byte, o ImageOptions) (Image, error) {
 	if o.Width == 0 && o.Height == 0 {
-		return Image{}, NewError("Missing required param: height or width", BadRequest)
+		return Image{}, NewError("Missing required param: height or width", http.StatusBadRequest)
 	}
 
 	opts := BimgOptions(o)
@@ -102,7 +102,7 @@ func Resize(buf []byte, o ImageOptions) (Image, error) {
 
 func Fit(buf []byte, o ImageOptions) (Image, error) {
 	if o.Width == 0 || o.Height == 0 {
-		return Image{}, NewError("Missing required params: height, width", BadRequest)
+		return Image{}, NewError("Missing required params: height, width", http.StatusBadRequest)
 	}
 
 	metadata, err := bimg.Metadata(buf)
@@ -113,7 +113,7 @@ func Fit(buf []byte, o ImageOptions) (Image, error) {
 	dims := metadata.Size
 
 	if dims.Width == 0 || dims.Height == 0 {
-		return Image{}, NewError("Width or height of requested image is zero", NotAcceptable)
+		return Image{}, NewError("Width or height of requested image is zero", http.StatusNotAcceptable)
 	}
 
 	// metadata.Orientation
@@ -165,7 +165,7 @@ func calculateDestinationFitDimension(imageWidth, imageHeight, fitWidth, fitHeig
 
 func Enlarge(buf []byte, o ImageOptions) (Image, error) {
 	if o.Width == 0 || o.Height == 0 {
-		return Image{}, NewError("Missing required params: height, width", BadRequest)
+		return Image{}, NewError("Missing required params: height, width", http.StatusBadRequest)
 	}
 
 	opts := BimgOptions(o)
@@ -179,7 +179,7 @@ func Enlarge(buf []byte, o ImageOptions) (Image, error) {
 
 func Extract(buf []byte, o ImageOptions) (Image, error) {
 	if o.AreaWidth == 0 || o.AreaHeight == 0 {
-		return Image{}, NewError("Missing required params: areawidth or areaheight", BadRequest)
+		return Image{}, NewError("Missing required params: areawidth or areaheight", http.StatusBadRequest)
 	}
 
 	opts := BimgOptions(o)
@@ -193,7 +193,7 @@ func Extract(buf []byte, o ImageOptions) (Image, error) {
 
 func Crop(buf []byte, o ImageOptions) (Image, error) {
 	if o.Width == 0 && o.Height == 0 {
-		return Image{}, NewError("Missing required param: height or width", BadRequest)
+		return Image{}, NewError("Missing required param: height or width", http.StatusBadRequest)
 	}
 
 	opts := BimgOptions(o)
@@ -203,7 +203,7 @@ func Crop(buf []byte, o ImageOptions) (Image, error) {
 
 func SmartCrop(buf []byte, o ImageOptions) (Image, error) {
 	if o.Width == 0 && o.Height == 0 {
-		return Image{}, NewError("Missing required param: height or width", BadRequest)
+		return Image{}, NewError("Missing required param: height or width", http.StatusBadRequest)
 	}
 
 	opts := BimgOptions(o)
@@ -214,7 +214,7 @@ func SmartCrop(buf []byte, o ImageOptions) (Image, error) {
 
 func Rotate(buf []byte, o ImageOptions) (Image, error) {
 	if o.Rotate == 0 {
-		return Image{}, NewError("Missing required param: rotate", BadRequest)
+		return Image{}, NewError("Missing required param: rotate", http.StatusBadRequest)
 	}
 
 	opts := BimgOptions(o)
@@ -235,7 +235,7 @@ func Flop(buf []byte, o ImageOptions) (Image, error) {
 
 func Thumbnail(buf []byte, o ImageOptions) (Image, error) {
 	if o.Width == 0 && o.Height == 0 {
-		return Image{}, NewError("Missing required params: width or height", BadRequest)
+		return Image{}, NewError("Missing required params: width or height", http.StatusBadRequest)
 	}
 
 	return Process(buf, BimgOptions(o))
@@ -243,14 +243,14 @@ func Thumbnail(buf []byte, o ImageOptions) (Image, error) {
 
 func Zoom(buf []byte, o ImageOptions) (Image, error) {
 	if o.Factor == 0 {
-		return Image{}, NewError("Missing required param: factor", BadRequest)
+		return Image{}, NewError("Missing required param: factor", http.StatusBadRequest)
 	}
 
 	opts := BimgOptions(o)
 
 	if o.Top > 0 || o.Left > 0 {
 		if o.AreaWidth == 0 && o.AreaHeight == 0 {
-			return Image{}, NewError("Missing required params: areawidth, areaheight", BadRequest)
+			return Image{}, NewError("Missing required params: areawidth, areaheight", http.StatusBadRequest)
 		}
 
 		opts.Top = o.Top
@@ -269,10 +269,10 @@ func Zoom(buf []byte, o ImageOptions) (Image, error) {
 
 func Convert(buf []byte, o ImageOptions) (Image, error) {
 	if o.Type == "" {
-		return Image{}, NewError("Missing required param: type", BadRequest)
+		return Image{}, NewError("Missing required param: type", http.StatusBadRequest)
 	}
 	if ImageType(o.Type) == bimg.UNKNOWN {
-		return Image{}, NewError("Invalid image type: "+o.Type, BadRequest)
+		return Image{}, NewError("Invalid image type: "+o.Type, http.StatusBadRequest)
 	}
 	opts := BimgOptions(o)
 
@@ -281,7 +281,7 @@ func Convert(buf []byte, o ImageOptions) (Image, error) {
 
 func Watermark(buf []byte, o ImageOptions) (Image, error) {
 	if o.Text == "" {
-		return Image{}, NewError("Missing required param: text", BadRequest)
+		return Image{}, NewError("Missing required param: text", http.StatusBadRequest)
 	}
 
 	opts := BimgOptions(o)
@@ -302,11 +302,11 @@ func Watermark(buf []byte, o ImageOptions) (Image, error) {
 
 func WatermarkImage(buf []byte, o ImageOptions) (Image, error) {
 	if o.Image == "" {
-		return Image{}, NewError("Missing required param: image", BadRequest)
+		return Image{}, NewError("Missing required param: image", http.StatusBadRequest)
 	}
 	response, err := http.Get(o.Image)
 	if err != nil {
-		return Image{}, NewError(fmt.Sprintf("Unable to retrieve watermark image. %s", o.Image), BadRequest)
+		return Image{}, NewError(fmt.Sprintf("Unable to retrieve watermark image. %s", o.Image), http.StatusBadRequest)
 	}
 	defer func() {
 		_ = response.Body.Close()
@@ -322,7 +322,7 @@ func WatermarkImage(buf []byte, o ImageOptions) (Image, error) {
 			errMessage = fmt.Sprintf("%s. %s", errMessage, err.Error())
 		}
 
-		return Image{}, NewError(errMessage, BadRequest)
+		return Image{}, NewError(errMessage, http.StatusBadRequest)
 	}
 
 	opts := BimgOptions(o)
@@ -336,7 +336,7 @@ func WatermarkImage(buf []byte, o ImageOptions) (Image, error) {
 
 func GaussianBlur(buf []byte, o ImageOptions) (Image, error) {
 	if o.Sigma == 0 && o.MinAmpl == 0 {
-		return Image{}, NewError("Missing required param: sigma or minampl", BadRequest)
+		return Image{}, NewError("Missing required param: sigma or minampl", http.StatusBadRequest)
 	}
 	opts := BimgOptions(o)
 	return Process(buf, opts)
@@ -344,10 +344,10 @@ func GaussianBlur(buf []byte, o ImageOptions) (Image, error) {
 
 func Pipeline(buf []byte, o ImageOptions) (Image, error) {
 	if len(o.Operations) == 0 {
-		return Image{}, NewError("Missing or invalid pipeline operations JSON", BadRequest)
+		return Image{}, NewError("Missing or invalid pipeline operations JSON", http.StatusBadRequest)
 	}
 	if len(o.Operations) > 10 {
-		return Image{}, NewError("Maximum allowed pipeline operations exceeded", BadRequest)
+		return Image{}, NewError("Maximum allowed pipeline operations exceeded", http.StatusBadRequest)
 	}
 
 	// Validate and built operations
@@ -355,7 +355,7 @@ func Pipeline(buf []byte, o ImageOptions) (Image, error) {
 		// Validate supported operation name
 		var exists bool
 		if operation.Operation, exists = OperationsMap[operation.Name]; !exists {
-			return Image{}, NewError(fmt.Sprintf("Unsupported operation name: %s", operation.Name), BadRequest)
+			return Image{}, NewError(fmt.Sprintf("Unsupported operation name: %s", operation.Name), http.StatusBadRequest)
 		}
 
 		// Parse and construct operation options
diff --git a/imaginary.go b/imaginary.go
index eac4da6..0b3e9e0 100644
--- a/imaginary.go
+++ b/imaginary.go
@@ -114,7 +114,7 @@ type URLSignature struct {
 
 func main() {
 	flag.Usage = func() {
-		_, _ = fmt.Fprint(os.Stderr, fmt.Sprintf(usage, Version, runtime.NumCPU()))
+		_, _ = fmt.Fprint(os.Stderr, usage, Version, runtime.NumCPU())
 	}
 	flag.Parse()
 
diff --git a/middleware.go b/middleware.go
index 2ab0c14..11a15db 100644
--- a/middleware.go
+++ b/middleware.go
@@ -9,8 +9,8 @@ import (
 	"strings"
 	"time"
 
-	"github.com/rs/cors"
 	"github.com/h2non/bimg"
+	"github.com/rs/cors"
 	"gopkg.in/throttled/throttled.v2"
 	"gopkg.in/throttled/throttled.v2/store/memstore"
 )
@@ -105,7 +105,7 @@ func validateImage(next http.Handler, o ServerOptions) http.Handler {
 		}
 
 		if r.Method == http.MethodGet && o.Mount == "" && !o.EnableURLSource {
-			ErrorReply(r, w, ErrMethodNotAllowed, o)
+			ErrorReply(r, w, ErrGetMethodNotAllowed, o)
 			return
 		}
 
diff --git a/params.go b/params.go
index cf1cf89..f4c59fd 100644
--- a/params.go
+++ b/params.go
@@ -344,9 +344,11 @@ func coerceInterlace(io *ImageOptions, param interface{}) (err error) {
 }
 
 func buildParamsFromOperation(op PipelineOperation) (ImageOptions, error) {
-
 	var options ImageOptions
 
+	// Apply defaults
+	options.Extend = bimg.ExtendCopy
+
 	for key, value := range op.Params {
 		fn, ok := paramTypeCoercions[key]
 		if !ok {
@@ -366,6 +368,9 @@ func buildParamsFromOperation(op PipelineOperation) (ImageOptions, error) {
 func buildParamsFromQuery(query url.Values) (ImageOptions, error) {
 	var options ImageOptions
 
+	// Apply defaults
+	options.Extend = bimg.ExtendCopy
+
 	// Extract only known parameters
 	for key := range query {
 		fn, ok := paramTypeCoercions[key]
@@ -448,8 +453,8 @@ func parseExtendMode(val string) bimg.Extend {
 	if val == "white" {
 		return bimg.ExtendWhite
 	}
-	if val == "copy" {
-		return bimg.ExtendCopy
+	if val == "black" {
+		return bimg.ExtendBlack
 	}
 	if val == "mirror" {
 		return bimg.ExtendMirror
@@ -457,7 +462,10 @@ func parseExtendMode(val string) bimg.Extend {
 	if val == "background" {
 		return bimg.ExtendBackground
 	}
-	return bimg.ExtendBlack
+	if val == "lastpixel" {
+		return bimg.ExtendLast
+	}
+	return bimg.ExtendCopy
 }
 
 func parseGravity(val string) bimg.Gravity {
diff --git a/params_test.go b/params_test.go
index 49a1542..e73d41f 100644
--- a/params_test.go
+++ b/params_test.go
@@ -141,10 +141,11 @@ func TestParseExtend(t *testing.T) {
 		{"black", bimg.ExtendBlack},
 		{"copy", bimg.ExtendCopy},
 		{"mirror", bimg.ExtendMirror},
+		{"lastpixel", bimg.ExtendLast},
 		{"background", bimg.ExtendBackground},
 		{" BACKGROUND  ", bimg.ExtendBackground},
-		{"invalid", bimg.ExtendBlack},
-		{"", bimg.ExtendBlack},
+		{"invalid", bimg.ExtendCopy},
+		{"", bimg.ExtendCopy},
 	}
 
 	for _, extend := range cases {
diff --git a/source_http.go b/source_http.go
index 863bc8f..5bfeeaa 100644
--- a/source_http.go
+++ b/source_http.go
@@ -41,11 +41,11 @@ func (s *HTTPImageSource) fetchImage(url *url.URL, ireq *http.Request) ([]byte,
 		req := newHTTPRequest(s, ireq, http.MethodHead, url)
 		res, err := http.DefaultClient.Do(req)
 		if err != nil {
-			return nil, fmt.Errorf("error fetching image http headers: %v", err)
+			return nil, fmt.Errorf("error fetching remote http image headers: %v", err)
 		}
 		_ = res.Body.Close()
 		if res.StatusCode < 200 && res.StatusCode > 206 {
-			return nil, fmt.Errorf("error fetching image http headers: (status=%d) (url=%s)", res.StatusCode, req.URL.String())
+			return nil, NewError(fmt.Sprintf("error fetching remote http image headers: (status=%d) (url=%s)", res.StatusCode, req.URL.String()), res.StatusCode)
 		}
 
 		contentLength, _ := strconv.Atoi(res.Header.Get("Content-Length"))
@@ -58,11 +58,11 @@ func (s *HTTPImageSource) fetchImage(url *url.URL, ireq *http.Request) ([]byte,
 	req := newHTTPRequest(s, ireq, http.MethodGet, url)
 	res, err := http.DefaultClient.Do(req)
 	if err != nil {
-		return nil, fmt.Errorf("error downloading image: %v", err)
+		return nil, fmt.Errorf("error fetching remote http image: %v", err)
 	}
 	defer res.Body.Close()
 	if res.StatusCode != 200 {
-		return nil, fmt.Errorf("error downloading image: (status=%d) (url=%s)", res.StatusCode, req.URL.String())
+		return nil, NewError(fmt.Sprintf("error fetching remote http image: (status=%d) (url=%s)", res.StatusCode, req.URL.String()), res.StatusCode)
 	}
 
 	// Read the body