Apply twitter-specific logic to x.com

Author: deorus

internal/useragent/useragent.go

@@ -5,10 +5,10 @@
 //
 // Basic usage:
 //
-// 	client := &http.Client{
-// 		Transport: useragent.Set(http.DefaultTransport, "MyRobot/1.0"),
-// 	}
-// 	resp, err := client.Get("https://...")
+//	client := &http.Client{
+//		Transport: useragent.Set(http.DefaultTransport, "MyRobot/1.0"),
+//	}
+//	resp, err := client.Get("https://...")
 package useragent
 
 import (
@@ -49,7 +49,8 @@ func (t uaT) RoundTrip(r *http.Request) (*http.Response, error) {
 		r2.Header[k] = v
 	}
 	r2.Header.Set("User-Agent", t.userAgent)
-	if r.URL.Host == "twitter.com" || strings.HasSuffix(r.URL.Host, ".twitter.com") {
+	if r.URL.Host == "twitter.com" || strings.HasSuffix(r.URL.Host, ".twitter.com") ||
+		r.URL.Host == "x.com" || strings.HasSuffix(r.URL.Host, ".x.com") {
 		r2.Header.Set("User-Agent", "DiscourseBot/1.0")
 	}
 	return t.Transport.RoundTrip(r2)

unfurlist.go

@@ -472,8 +472,9 @@ func (h *unfurlHandler) fetchData(ctx context.Context, URL string) (*pageChunk,
 		return &pageChunk{url: resp.Request.URL}, errors.New("bad status: " + resp.Status)
 	}
 	if resp.Header.Get("Content-Encoding") == "deflate" &&
-		strings.HasSuffix(resp.Request.Host, "twitter.com") {
-		// twitter sends unsolicited deflate-encoded responses
+		(strings.HasSuffix(resp.Request.Host, "twitter.com") ||
+			strings.HasSuffix(resp.Request.Host, "x.com")) {
+		// twitter/X sends unsolicited deflate-encoded responses
 		// violating RFC; workaround this.
 		// See https://golang.org/issues/18779 for background
 		var err error