Upon receiving unexpected status code, attempt to retrieve the body

client.go

@@ -296,7 +296,6 @@ func (c *Client) authenticateRequest(req *http.Request) {
 	} else if c.Auth.token.Valid() {
 		c.Auth.token.SetAuthHeader(req)
 	}
-	return
 }
 
 func (c *Client) doRequest(req *http.Request, emptyResponse bool) (interface{}, error) {
@@ -356,8 +355,18 @@ func (c *Client) doRawRequest(req *http.Request, emptyResponse bool) (io.ReadClo
 	}
 
 	if unexpectedHttpStatusCode(resp.StatusCode) {
-		resp.Body.Close()
-		return nil, fmt.Errorf(resp.Status)
+		defer resp.Body.Close()
+
+		out := &UnexpectedResponseStatusError{Status: resp.Status}
+
+		body, err := io.ReadAll(resp.Body)
+		if err != nil {
+			out.Body = []byte(fmt.Sprintf("could not read the response body: %v", err))
+		} else {
+			out.Body = body
+		}
+
+		return nil, out
 	}
 
 	if emptyResponse || resp.StatusCode == http.StatusNoContent {

error.go

@@ -2,6 +2,7 @@ package bitbucket
 
 import (
 	"errors"
+	"fmt"
 
 	"github.com/mitchellh/mapstructure"
 )
@@ -20,3 +21,20 @@ func DecodeError(e map[string]interface{}) error {
 
 	return errors.New(bitbucketError.Message)
 }
+
+// UnexpectedResponseStatusError represents an unexpected status code
+// returned from the API, along with the body, if it could be read. If the body
+// could not be read, the body contains the error message trying to read it.
+type UnexpectedResponseStatusError struct {
+	Status string
+	Body   []byte
+}
+
+func (e *UnexpectedResponseStatusError) Error() string {
+	return e.Status
+}
+
+// ErrorWithBody returns an error with the given status and body.
+func (e *UnexpectedResponseStatusError) ErrorWithBody() error {
+	return fmt.Errorf("unexpected status %s, body: %s", e.Status, string(e.Body))
+}