Add spacing to improve readability of fingerprint (#4588)

CHANGELOG.md

@@ -60,6 +60,7 @@ If you depend on these features, please raise your voice in
 * Switch Docker image release to be based on Debian (@PeterDaveHello)
 * Multiple Browsers: The `browser.start` command may be executed more than once to start additional
   browser sessions. (@rbdixon)
+* Improve readability of SHA256 fingerprint. (@wrekone)
 * --- TODO: add new PRs above this line ---
 * ... and various other fixes, documentation improvements, dependency version bumps, etc.
 

mitmproxy/tools/console/flowdetailview.py

@@ -60,7 +60,7 @@ def flowdetails(state, flow: mitmproxy.flow.Flow):
             text.append(urwid.Text([("head", "Server Certificate:")]))
             parts = [
                 ("Type", "%s, %s bits" % c.keyinfo),
-                ("SHA256 digest", c.fingerprint().hex()),
+                ("SHA256 digest", c.fingerprint().hex(' ')),
                 ("Valid to", str(c.notafter)),
                 ("Valid from", str(c.notbefore)),
                 ("Serial", str(c.serial)),