allow easy replacing of rest url

rest/rest_client.go

@@ -21,7 +21,10 @@ func NewClient(botToken string, opts ...ConfigOpt) Client {
 
 	config.RateLimiter.Reset()
 
-	return &clientImpl{botToken: botToken, config: *config}
+	return &clientImpl{
+		botToken: botToken,
+		config:   *config,
+	}
 }
 
 // Client allows doing requests to different endpoints
@@ -83,7 +86,7 @@ func (c *clientImpl) retry(endpoint *CompiledEndpoint, rqBody any, rsBody any, t
 		c.config.Logger.Tracef("request to %s, body: %s", endpoint.URL, string(rawRqBody))
 	}
 
-	rq, err := http.NewRequest(endpoint.Endpoint.Method, endpoint.URL, bytes.NewReader(rawRqBody))
+	rq, err := http.NewRequest(endpoint.Endpoint.Method, c.config.URL+endpoint.URL, bytes.NewReader(rawRqBody))
 	if err != nil {
 		return err
 	}

rest/rest_config.go

@@ -1,6 +1,7 @@
 package rest
 
 import (
+	"fmt"
 	"net/http"
 	"time"
 
@@ -12,6 +13,7 @@ func DefaultConfig() *Config {
 	return &Config{
 		Logger:     log.Default(),
 		HTTPClient: &http.Client{Timeout: 20 * time.Second},
+		URL:        fmt.Sprintf("%s/v%d", API, Version),
 	}
 }
 
@@ -21,6 +23,7 @@ type Config struct {
 	HTTPClient                *http.Client
 	RateLimiter               RateLimiter
 	RateRateLimiterConfigOpts []RateLimiterConfigOpt
+	URL                       string
 	UserAgent                 string
 }
 
@@ -65,6 +68,13 @@ func WithRateRateLimiterConfigOpts(opts ...RateLimiterConfigOpt) ConfigOpt {
 	}
 }
 
+// WithURL sets the api url for all requests
+func WithURL(url string) ConfigOpt {
+	return func(config *Config) {
+		config.URL = url
+	}
+}
+
 // WithUserAgent sets the user agent for all requests
 func WithUserAgent(userAgent string) ConfigOpt {
 	return func(config *Config) {

rest/rest_endpoints.go

@@ -9,11 +9,11 @@ import (
 )
 
 var (
-	// APIVersion is the Discord API version DisGo should use
-	APIVersion = 10
+	// Version is the Discord API version DisGo should use
+	Version = 10
 
 	// API is the base path of the Discord API
-	API = fmt.Sprintf("https://discord.com/api/v%d", APIVersion)
+	API = "https://discord.com/api/"
 )
 
 // MajorParameters is a list of url parameters which decide in which bucket a route belongs (https://discord.com/developers/docs/topics/rate-limits#rate-limits)
@@ -346,7 +346,7 @@ func (e *Endpoint) Compile(values discord.QueryValues, params ...any) *CompiledE
 
 	return &CompiledEndpoint{
 		Endpoint:    e,
-		URL:         API + path + query,
+		URL:         path + query,
 		MajorParams: strings.Join(majorParams, ":"),
 	}
 }