Fix encoding of metadata values containing special characters

ia-upload-stream

@@ -23,6 +23,7 @@ try:
 except ImportError:
 	tqdm = None
 import types
+import urllib.parse
 
 
 logger = logging.getLogger()
@@ -87,7 +88,7 @@ def metadata_to_headers(metadata):
 	if isinstance(metadata, dict):
 		metadata = metadata.items()
 	for key, value in metadata:
-		headers[f'x-archive-meta{counters[key]:02d}-{key.replace("_", "--")}'] = value.encode('utf-8')
+		headers[f'x-archive-meta{counters[key]:02d}-{key.replace("_", "--")}'] = f'uri({urllib.parse.quote(value.encode("utf-8"))})'
 		counters[key] += 1
 	return headers