diff --git a/assert/assertion_format.go b/assert/assertion_format.go
index 0b7606d..3e172f2 100644
--- a/assert/assertion_format.go
+++ b/assert/assertion_format.go
@@ -139,8 +139,8 @@ func FileExistsf(t TestingT, path string, msg string, args ...interface{}) bool
 //  assert.HTTPBodyContainsf(t, myHandler, "www.google.com", nil, "I'm Feeling Lucky", "error message %s", "formatted")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func HTTPBodyContainsf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, str interface{}) bool {
-	return HTTPBodyContains(t, handler, method, url, values, str)
+func HTTPBodyContainsf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msg string, args ...interface{}) bool {
+	return HTTPBodyContains(t, handler, method, url, values, str, append([]interface{}{msg}, args...)...)
 }
 
 // HTTPBodyNotContainsf asserts that a specified handler returns a
@@ -149,8 +149,8 @@ func HTTPBodyContainsf(t TestingT, handler http.HandlerFunc, method string, url
 //  assert.HTTPBodyNotContainsf(t, myHandler, "www.google.com", nil, "I'm Feeling Lucky", "error message %s", "formatted")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func HTTPBodyNotContainsf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, str interface{}) bool {
-	return HTTPBodyNotContains(t, handler, method, url, values, str)
+func HTTPBodyNotContainsf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msg string, args ...interface{}) bool {
+	return HTTPBodyNotContains(t, handler, method, url, values, str, append([]interface{}{msg}, args...)...)
 }
 
 // HTTPErrorf asserts that a specified handler returns an error status code.
@@ -158,8 +158,8 @@ func HTTPBodyNotContainsf(t TestingT, handler http.HandlerFunc, method string, u
 //  assert.HTTPErrorf(t, myHandler, "POST", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true, "error message %s", "formatted") or not (false).
-func HTTPErrorf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values) bool {
-	return HTTPError(t, handler, method, url, values)
+func HTTPErrorf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) bool {
+	return HTTPError(t, handler, method, url, values, append([]interface{}{msg}, args...)...)
 }
 
 // HTTPRedirectf asserts that a specified handler returns a redirect status code.
@@ -167,8 +167,8 @@ func HTTPErrorf(t TestingT, handler http.HandlerFunc, method string, url string,
 //  assert.HTTPRedirectf(t, myHandler, "GET", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true, "error message %s", "formatted") or not (false).
-func HTTPRedirectf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values) bool {
-	return HTTPRedirect(t, handler, method, url, values)
+func HTTPRedirectf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) bool {
+	return HTTPRedirect(t, handler, method, url, values, append([]interface{}{msg}, args...)...)
 }
 
 // HTTPSuccessf asserts that a specified handler returns a success status code.
@@ -176,8 +176,8 @@ func HTTPRedirectf(t TestingT, handler http.HandlerFunc, method string, url stri
 //  assert.HTTPSuccessf(t, myHandler, "POST", "http://www.google.com", nil, "error message %s", "formatted")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func HTTPSuccessf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values) bool {
-	return HTTPSuccess(t, handler, method, url, values)
+func HTTPSuccessf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) bool {
+	return HTTPSuccess(t, handler, method, url, values, append([]interface{}{msg}, args...)...)
 }
 
 // Implementsf asserts that an object is implemented by the specified interface.
diff --git a/assert/assertion_forward.go b/assert/assertion_forward.go
index c32c998..7c4f497 100644
--- a/assert/assertion_forward.go
+++ b/assert/assertion_forward.go
@@ -261,8 +261,8 @@ func (a *Assertions) FileExistsf(path string, msg string, args ...interface{}) b
 //  a.HTTPBodyContains(myHandler, "www.google.com", nil, "I'm Feeling Lucky")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) HTTPBodyContains(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}) bool {
-	return HTTPBodyContains(a.t, handler, method, url, values, str)
+func (a *Assertions) HTTPBodyContains(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msgAndArgs ...interface{}) bool {
+	return HTTPBodyContains(a.t, handler, method, url, values, str, msgAndArgs...)
 }
 
 // HTTPBodyContainsf asserts that a specified handler returns a
@@ -271,8 +271,8 @@ func (a *Assertions) HTTPBodyContains(handler http.HandlerFunc, method string, u
 //  a.HTTPBodyContainsf(myHandler, "www.google.com", nil, "I'm Feeling Lucky", "error message %s", "formatted")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) HTTPBodyContainsf(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}) bool {
-	return HTTPBodyContainsf(a.t, handler, method, url, values, str)
+func (a *Assertions) HTTPBodyContainsf(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msg string, args ...interface{}) bool {
+	return HTTPBodyContainsf(a.t, handler, method, url, values, str, msg, args...)
 }
 
 // HTTPBodyNotContains asserts that a specified handler returns a
@@ -281,8 +281,8 @@ func (a *Assertions) HTTPBodyContainsf(handler http.HandlerFunc, method string,
 //  a.HTTPBodyNotContains(myHandler, "www.google.com", nil, "I'm Feeling Lucky")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) HTTPBodyNotContains(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}) bool {
-	return HTTPBodyNotContains(a.t, handler, method, url, values, str)
+func (a *Assertions) HTTPBodyNotContains(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msgAndArgs ...interface{}) bool {
+	return HTTPBodyNotContains(a.t, handler, method, url, values, str, msgAndArgs...)
 }
 
 // HTTPBodyNotContainsf asserts that a specified handler returns a
@@ -291,8 +291,8 @@ func (a *Assertions) HTTPBodyNotContains(handler http.HandlerFunc, method string
 //  a.HTTPBodyNotContainsf(myHandler, "www.google.com", nil, "I'm Feeling Lucky", "error message %s", "formatted")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) HTTPBodyNotContainsf(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}) bool {
-	return HTTPBodyNotContainsf(a.t, handler, method, url, values, str)
+func (a *Assertions) HTTPBodyNotContainsf(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msg string, args ...interface{}) bool {
+	return HTTPBodyNotContainsf(a.t, handler, method, url, values, str, msg, args...)
 }
 
 // HTTPError asserts that a specified handler returns an error status code.
@@ -300,8 +300,8 @@ func (a *Assertions) HTTPBodyNotContainsf(handler http.HandlerFunc, method strin
 //  a.HTTPError(myHandler, "POST", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) HTTPError(handler http.HandlerFunc, method string, url string, values url.Values) bool {
-	return HTTPError(a.t, handler, method, url, values)
+func (a *Assertions) HTTPError(handler http.HandlerFunc, method string, url string, values url.Values, msgAndArgs ...interface{}) bool {
+	return HTTPError(a.t, handler, method, url, values, msgAndArgs...)
 }
 
 // HTTPErrorf asserts that a specified handler returns an error status code.
@@ -309,8 +309,8 @@ func (a *Assertions) HTTPError(handler http.HandlerFunc, method string, url stri
 //  a.HTTPErrorf(myHandler, "POST", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true, "error message %s", "formatted") or not (false).
-func (a *Assertions) HTTPErrorf(handler http.HandlerFunc, method string, url string, values url.Values) bool {
-	return HTTPErrorf(a.t, handler, method, url, values)
+func (a *Assertions) HTTPErrorf(handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) bool {
+	return HTTPErrorf(a.t, handler, method, url, values, msg, args...)
 }
 
 // HTTPRedirect asserts that a specified handler returns a redirect status code.
@@ -318,8 +318,8 @@ func (a *Assertions) HTTPErrorf(handler http.HandlerFunc, method string, url str
 //  a.HTTPRedirect(myHandler, "GET", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) HTTPRedirect(handler http.HandlerFunc, method string, url string, values url.Values) bool {
-	return HTTPRedirect(a.t, handler, method, url, values)
+func (a *Assertions) HTTPRedirect(handler http.HandlerFunc, method string, url string, values url.Values, msgAndArgs ...interface{}) bool {
+	return HTTPRedirect(a.t, handler, method, url, values, msgAndArgs...)
 }
 
 // HTTPRedirectf asserts that a specified handler returns a redirect status code.
@@ -327,8 +327,8 @@ func (a *Assertions) HTTPRedirect(handler http.HandlerFunc, method string, url s
 //  a.HTTPRedirectf(myHandler, "GET", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true, "error message %s", "formatted") or not (false).
-func (a *Assertions) HTTPRedirectf(handler http.HandlerFunc, method string, url string, values url.Values) bool {
-	return HTTPRedirectf(a.t, handler, method, url, values)
+func (a *Assertions) HTTPRedirectf(handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) bool {
+	return HTTPRedirectf(a.t, handler, method, url, values, msg, args...)
 }
 
 // HTTPSuccess asserts that a specified handler returns a success status code.
@@ -336,8 +336,8 @@ func (a *Assertions) HTTPRedirectf(handler http.HandlerFunc, method string, url
 //  a.HTTPSuccess(myHandler, "POST", "http://www.google.com", nil)
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) HTTPSuccess(handler http.HandlerFunc, method string, url string, values url.Values) bool {
-	return HTTPSuccess(a.t, handler, method, url, values)
+func (a *Assertions) HTTPSuccess(handler http.HandlerFunc, method string, url string, values url.Values, msgAndArgs ...interface{}) bool {
+	return HTTPSuccess(a.t, handler, method, url, values, msgAndArgs...)
 }
 
 // HTTPSuccessf asserts that a specified handler returns a success status code.
@@ -345,8 +345,8 @@ func (a *Assertions) HTTPSuccess(handler http.HandlerFunc, method string, url st
 //  a.HTTPSuccessf(myHandler, "POST", "http://www.google.com", nil, "error message %s", "formatted")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) HTTPSuccessf(handler http.HandlerFunc, method string, url string, values url.Values) bool {
-	return HTTPSuccessf(a.t, handler, method, url, values)
+func (a *Assertions) HTTPSuccessf(handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) bool {
+	return HTTPSuccessf(a.t, handler, method, url, values, msg, args...)
 }
 
 // Implements asserts that an object is implemented by the specified interface.
diff --git a/assert/http_assertions.go b/assert/http_assertions.go
index ba811c0..3101e78 100644
--- a/assert/http_assertions.go
+++ b/assert/http_assertions.go
@@ -25,7 +25,7 @@ func httpCode(handler http.HandlerFunc, method, url string, values url.Values) (
 //  assert.HTTPSuccess(t, myHandler, "POST", "http://www.google.com", nil)
 //
 // Returns whether the assertion was successful (true) or not (false).
-func HTTPSuccess(t TestingT, handler http.HandlerFunc, method, url string, values url.Values) bool {
+func HTTPSuccess(t TestingT, handler http.HandlerFunc, method, url string, values url.Values, msgAndArgs ...interface{}) bool {
 	code, err := httpCode(handler, method, url, values)
 	if err != nil {
 		Fail(t, fmt.Sprintf("Failed to build test request, got error: %s", err))
@@ -45,7 +45,7 @@ func HTTPSuccess(t TestingT, handler http.HandlerFunc, method, url string, value
 //  assert.HTTPRedirect(t, myHandler, "GET", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true) or not (false).
-func HTTPRedirect(t TestingT, handler http.HandlerFunc, method, url string, values url.Values) bool {
+func HTTPRedirect(t TestingT, handler http.HandlerFunc, method, url string, values url.Values, msgAndArgs ...interface{}) bool {
 	code, err := httpCode(handler, method, url, values)
 	if err != nil {
 		Fail(t, fmt.Sprintf("Failed to build test request, got error: %s", err))
@@ -65,7 +65,7 @@ func HTTPRedirect(t TestingT, handler http.HandlerFunc, method, url string, valu
 //  assert.HTTPError(t, myHandler, "POST", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true) or not (false).
-func HTTPError(t TestingT, handler http.HandlerFunc, method, url string, values url.Values) bool {
+func HTTPError(t TestingT, handler http.HandlerFunc, method, url string, values url.Values, msgAndArgs ...interface{}) bool {
 	code, err := httpCode(handler, method, url, values)
 	if err != nil {
 		Fail(t, fmt.Sprintf("Failed to build test request, got error: %s", err))
@@ -98,7 +98,7 @@ func HTTPBody(handler http.HandlerFunc, method, url string, values url.Values) s
 //  assert.HTTPBodyContains(t, myHandler, "www.google.com", nil, "I'm Feeling Lucky")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func HTTPBodyContains(t TestingT, handler http.HandlerFunc, method, url string, values url.Values, str interface{}) bool {
+func HTTPBodyContains(t TestingT, handler http.HandlerFunc, method, url string, values url.Values, str interface{}, msgAndArgs ...interface{}) bool {
 	body := HTTPBody(handler, method, url, values)
 
 	contains := strings.Contains(body, fmt.Sprint(str))
@@ -115,7 +115,7 @@ func HTTPBodyContains(t TestingT, handler http.HandlerFunc, method, url string,
 //  assert.HTTPBodyNotContains(t, myHandler, "www.google.com", nil, "I'm Feeling Lucky")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func HTTPBodyNotContains(t TestingT, handler http.HandlerFunc, method, url string, values url.Values, str interface{}) bool {
+func HTTPBodyNotContains(t TestingT, handler http.HandlerFunc, method, url string, values url.Values, str interface{}, msgAndArgs ...interface{}) bool {
 	body := HTTPBody(handler, method, url, values)
 
 	contains := strings.Contains(body, fmt.Sprint(str))
diff --git a/require/require.go b/require/require.go
index 93f678d..a21d02f 100644
--- a/require/require.go
+++ b/require/require.go
@@ -318,8 +318,8 @@ func FileExistsf(t TestingT, path string, msg string, args ...interface{}) {
 //  assert.HTTPBodyContains(t, myHandler, "www.google.com", nil, "I'm Feeling Lucky")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func HTTPBodyContains(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, str interface{}) {
-	if !assert.HTTPBodyContains(t, handler, method, url, values, str) {
+func HTTPBodyContains(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msgAndArgs ...interface{}) {
+	if !assert.HTTPBodyContains(t, handler, method, url, values, str, msgAndArgs...) {
 		t.FailNow()
 	}
 }
@@ -330,8 +330,8 @@ func HTTPBodyContains(t TestingT, handler http.HandlerFunc, method string, url s
 //  assert.HTTPBodyContainsf(t, myHandler, "www.google.com", nil, "I'm Feeling Lucky", "error message %s", "formatted")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func HTTPBodyContainsf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, str interface{}) {
-	if !assert.HTTPBodyContainsf(t, handler, method, url, values, str) {
+func HTTPBodyContainsf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msg string, args ...interface{}) {
+	if !assert.HTTPBodyContainsf(t, handler, method, url, values, str, msg, args...) {
 		t.FailNow()
 	}
 }
@@ -342,8 +342,8 @@ func HTTPBodyContainsf(t TestingT, handler http.HandlerFunc, method string, url
 //  assert.HTTPBodyNotContains(t, myHandler, "www.google.com", nil, "I'm Feeling Lucky")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func HTTPBodyNotContains(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, str interface{}) {
-	if !assert.HTTPBodyNotContains(t, handler, method, url, values, str) {
+func HTTPBodyNotContains(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msgAndArgs ...interface{}) {
+	if !assert.HTTPBodyNotContains(t, handler, method, url, values, str, msgAndArgs...) {
 		t.FailNow()
 	}
 }
@@ -354,8 +354,8 @@ func HTTPBodyNotContains(t TestingT, handler http.HandlerFunc, method string, ur
 //  assert.HTTPBodyNotContainsf(t, myHandler, "www.google.com", nil, "I'm Feeling Lucky", "error message %s", "formatted")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func HTTPBodyNotContainsf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, str interface{}) {
-	if !assert.HTTPBodyNotContainsf(t, handler, method, url, values, str) {
+func HTTPBodyNotContainsf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msg string, args ...interface{}) {
+	if !assert.HTTPBodyNotContainsf(t, handler, method, url, values, str, msg, args...) {
 		t.FailNow()
 	}
 }
@@ -365,8 +365,8 @@ func HTTPBodyNotContainsf(t TestingT, handler http.HandlerFunc, method string, u
 //  assert.HTTPError(t, myHandler, "POST", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true) or not (false).
-func HTTPError(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values) {
-	if !assert.HTTPError(t, handler, method, url, values) {
+func HTTPError(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, msgAndArgs ...interface{}) {
+	if !assert.HTTPError(t, handler, method, url, values, msgAndArgs...) {
 		t.FailNow()
 	}
 }
@@ -376,8 +376,8 @@ func HTTPError(t TestingT, handler http.HandlerFunc, method string, url string,
 //  assert.HTTPErrorf(t, myHandler, "POST", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true, "error message %s", "formatted") or not (false).
-func HTTPErrorf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values) {
-	if !assert.HTTPErrorf(t, handler, method, url, values) {
+func HTTPErrorf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) {
+	if !assert.HTTPErrorf(t, handler, method, url, values, msg, args...) {
 		t.FailNow()
 	}
 }
@@ -387,8 +387,8 @@ func HTTPErrorf(t TestingT, handler http.HandlerFunc, method string, url string,
 //  assert.HTTPRedirect(t, myHandler, "GET", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true) or not (false).
-func HTTPRedirect(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values) {
-	if !assert.HTTPRedirect(t, handler, method, url, values) {
+func HTTPRedirect(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, msgAndArgs ...interface{}) {
+	if !assert.HTTPRedirect(t, handler, method, url, values, msgAndArgs...) {
 		t.FailNow()
 	}
 }
@@ -398,8 +398,8 @@ func HTTPRedirect(t TestingT, handler http.HandlerFunc, method string, url strin
 //  assert.HTTPRedirectf(t, myHandler, "GET", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true, "error message %s", "formatted") or not (false).
-func HTTPRedirectf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values) {
-	if !assert.HTTPRedirectf(t, handler, method, url, values) {
+func HTTPRedirectf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) {
+	if !assert.HTTPRedirectf(t, handler, method, url, values, msg, args...) {
 		t.FailNow()
 	}
 }
@@ -409,8 +409,8 @@ func HTTPRedirectf(t TestingT, handler http.HandlerFunc, method string, url stri
 //  assert.HTTPSuccess(t, myHandler, "POST", "http://www.google.com", nil)
 //
 // Returns whether the assertion was successful (true) or not (false).
-func HTTPSuccess(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values) {
-	if !assert.HTTPSuccess(t, handler, method, url, values) {
+func HTTPSuccess(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, msgAndArgs ...interface{}) {
+	if !assert.HTTPSuccess(t, handler, method, url, values, msgAndArgs...) {
 		t.FailNow()
 	}
 }
@@ -420,8 +420,8 @@ func HTTPSuccess(t TestingT, handler http.HandlerFunc, method string, url string
 //  assert.HTTPSuccessf(t, myHandler, "POST", "http://www.google.com", nil, "error message %s", "formatted")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func HTTPSuccessf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values) {
-	if !assert.HTTPSuccessf(t, handler, method, url, values) {
+func HTTPSuccessf(t TestingT, handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) {
+	if !assert.HTTPSuccessf(t, handler, method, url, values, msg, args...) {
 		t.FailNow()
 	}
 }
diff --git a/require/require_forward.go b/require/require_forward.go
index 17c778b..7694085 100644
--- a/require/require_forward.go
+++ b/require/require_forward.go
@@ -262,8 +262,8 @@ func (a *Assertions) FileExistsf(path string, msg string, args ...interface{}) {
 //  a.HTTPBodyContains(myHandler, "www.google.com", nil, "I'm Feeling Lucky")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) HTTPBodyContains(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}) {
-	HTTPBodyContains(a.t, handler, method, url, values, str)
+func (a *Assertions) HTTPBodyContains(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msgAndArgs ...interface{}) {
+	HTTPBodyContains(a.t, handler, method, url, values, str, msgAndArgs...)
 }
 
 // HTTPBodyContainsf asserts that a specified handler returns a
@@ -272,8 +272,8 @@ func (a *Assertions) HTTPBodyContains(handler http.HandlerFunc, method string, u
 //  a.HTTPBodyContainsf(myHandler, "www.google.com", nil, "I'm Feeling Lucky", "error message %s", "formatted")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) HTTPBodyContainsf(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}) {
-	HTTPBodyContainsf(a.t, handler, method, url, values, str)
+func (a *Assertions) HTTPBodyContainsf(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msg string, args ...interface{}) {
+	HTTPBodyContainsf(a.t, handler, method, url, values, str, msg, args...)
 }
 
 // HTTPBodyNotContains asserts that a specified handler returns a
@@ -282,8 +282,8 @@ func (a *Assertions) HTTPBodyContainsf(handler http.HandlerFunc, method string,
 //  a.HTTPBodyNotContains(myHandler, "www.google.com", nil, "I'm Feeling Lucky")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) HTTPBodyNotContains(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}) {
-	HTTPBodyNotContains(a.t, handler, method, url, values, str)
+func (a *Assertions) HTTPBodyNotContains(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msgAndArgs ...interface{}) {
+	HTTPBodyNotContains(a.t, handler, method, url, values, str, msgAndArgs...)
 }
 
 // HTTPBodyNotContainsf asserts that a specified handler returns a
@@ -292,8 +292,8 @@ func (a *Assertions) HTTPBodyNotContains(handler http.HandlerFunc, method string
 //  a.HTTPBodyNotContainsf(myHandler, "www.google.com", nil, "I'm Feeling Lucky", "error message %s", "formatted")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) HTTPBodyNotContainsf(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}) {
-	HTTPBodyNotContainsf(a.t, handler, method, url, values, str)
+func (a *Assertions) HTTPBodyNotContainsf(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}, msg string, args ...interface{}) {
+	HTTPBodyNotContainsf(a.t, handler, method, url, values, str, msg, args...)
 }
 
 // HTTPError asserts that a specified handler returns an error status code.
@@ -301,8 +301,8 @@ func (a *Assertions) HTTPBodyNotContainsf(handler http.HandlerFunc, method strin
 //  a.HTTPError(myHandler, "POST", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) HTTPError(handler http.HandlerFunc, method string, url string, values url.Values) {
-	HTTPError(a.t, handler, method, url, values)
+func (a *Assertions) HTTPError(handler http.HandlerFunc, method string, url string, values url.Values, msgAndArgs ...interface{}) {
+	HTTPError(a.t, handler, method, url, values, msgAndArgs...)
 }
 
 // HTTPErrorf asserts that a specified handler returns an error status code.
@@ -310,8 +310,8 @@ func (a *Assertions) HTTPError(handler http.HandlerFunc, method string, url stri
 //  a.HTTPErrorf(myHandler, "POST", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true, "error message %s", "formatted") or not (false).
-func (a *Assertions) HTTPErrorf(handler http.HandlerFunc, method string, url string, values url.Values) {
-	HTTPErrorf(a.t, handler, method, url, values)
+func (a *Assertions) HTTPErrorf(handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) {
+	HTTPErrorf(a.t, handler, method, url, values, msg, args...)
 }
 
 // HTTPRedirect asserts that a specified handler returns a redirect status code.
@@ -319,8 +319,8 @@ func (a *Assertions) HTTPErrorf(handler http.HandlerFunc, method string, url str
 //  a.HTTPRedirect(myHandler, "GET", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) HTTPRedirect(handler http.HandlerFunc, method string, url string, values url.Values) {
-	HTTPRedirect(a.t, handler, method, url, values)
+func (a *Assertions) HTTPRedirect(handler http.HandlerFunc, method string, url string, values url.Values, msgAndArgs ...interface{}) {
+	HTTPRedirect(a.t, handler, method, url, values, msgAndArgs...)
 }
 
 // HTTPRedirectf asserts that a specified handler returns a redirect status code.
@@ -328,8 +328,8 @@ func (a *Assertions) HTTPRedirect(handler http.HandlerFunc, method string, url s
 //  a.HTTPRedirectf(myHandler, "GET", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true, "error message %s", "formatted") or not (false).
-func (a *Assertions) HTTPRedirectf(handler http.HandlerFunc, method string, url string, values url.Values) {
-	HTTPRedirectf(a.t, handler, method, url, values)
+func (a *Assertions) HTTPRedirectf(handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) {
+	HTTPRedirectf(a.t, handler, method, url, values, msg, args...)
 }
 
 // HTTPSuccess asserts that a specified handler returns a success status code.
@@ -337,8 +337,8 @@ func (a *Assertions) HTTPRedirectf(handler http.HandlerFunc, method string, url
 //  a.HTTPSuccess(myHandler, "POST", "http://www.google.com", nil)
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) HTTPSuccess(handler http.HandlerFunc, method string, url string, values url.Values) {
-	HTTPSuccess(a.t, handler, method, url, values)
+func (a *Assertions) HTTPSuccess(handler http.HandlerFunc, method string, url string, values url.Values, msgAndArgs ...interface{}) {
+	HTTPSuccess(a.t, handler, method, url, values, msgAndArgs...)
 }
 
 // HTTPSuccessf asserts that a specified handler returns a success status code.
@@ -346,8 +346,8 @@ func (a *Assertions) HTTPSuccess(handler http.HandlerFunc, method string, url st
 //  a.HTTPSuccessf(myHandler, "POST", "http://www.google.com", nil, "error message %s", "formatted")
 //
 // Returns whether the assertion was successful (true) or not (false).
-func (a *Assertions) HTTPSuccessf(handler http.HandlerFunc, method string, url string, values url.Values) {
-	HTTPSuccessf(a.t, handler, method, url, values)
+func (a *Assertions) HTTPSuccessf(handler http.HandlerFunc, method string, url string, values url.Values, msg string, args ...interface{}) {
+	HTTPSuccessf(a.t, handler, method, url, values, msg, args...)
 }
 
 // Implements asserts that an object is implemented by the specified interface.