fix: cancel.json now works on Windows, closes #83

docs/news.rst

@@ -24,6 +24,7 @@ Changed
 Fixed
 ~~~~~
 
+- The :ref:`cancel.json` webservice now works on Windows.
 - When managing multiple projects, the next pending job for all but one project was unreported by the :ref:`daemonstatus.json` and :ref:`listjobs.json` webservices, and was not cancellable by the :ref:`cancel.json` webservice.
 
 1.4.3 (2023-09-25)
@@ -138,7 +139,7 @@ Fixed
 
 - Fix HTTP header types for newer Twisted versions.
 - ``DeferredQueue`` no longer hides a pending job when reaching ``max_proc``.
-- ``AddVersion``'s arguments' string types no longer break Windows environments.
+- The :ref:`addversion.json`` webservice now works on Windows.
 - test: Update binary eggs to be compatible with Scrapy 1.x.
 
 Removed

scrapyd/webservice.py

@@ -1,3 +1,4 @@
+import sys
 import traceback
 import uuid
 from copy import copy
@@ -69,7 +70,7 @@ def render_POST(self, txrequest):
         args = {k: v[0] for k, v in native_stringify_dict(copy(txrequest.args), keys_only=False).items()}
         project = args['project']
         jobid = args['job']
-        signal = args.get('signal', 'TERM')
+        signal = args.get('signal', 'INT' if sys.platform != 'win32' else 'BREAK')
         prevstate = None
         queue = self.root.poller.queues[project]
         c = queue.remove(lambda x: x["_job"] == jobid)