# Buggy code
def render_GET(self, request):
    """
    .. http:get:: /search/completions?q=(string:query)

    A GET request to this endpoint will return autocompletion suggestions for the given query. For instance,
    when searching for "pioneer", this endpoint might return "pioneer one" if that torrent is present in the
    local database. This endpoint can be used to suggest terms to users while they type their search query.

        **Example request**:

        .. sourcecode:: none

            curl -X GET http://localhost:8085/search/completions?q=pioneer

        **Example response**:

        .. sourcecode:: javascript

            {
                "completions": ["pioneer one", "pioneer movie"]
            }
    """
    if "q" not in request.args:
        request.setResponseCode(http.BAD_REQUEST)
        return json.twisted_dumps({"error": "query parameter missing"})

    keywords = cast_to_unicode_utf8(request.args[b"q"][0]).lower()
    # TODO: add XXX filtering for completion terms
    results = self.session.lm.mds.TorrentMetadata.get_auto_complete_terms(
        keywords, max_terms=5
    )
    return json.twisted_dumps({"completions": results})


# Traceback (RuntimeError)
Traceback (most recent call last):
File "TriblerGUI\core_manager.py", line 118, in on_received_state
RuntimeError: [Failure instance: Traceback: <type 'exceptions.ValueError'>: The filename, directory name, or volume label syntax is incorrect
run_tribler.py:85:start_tribler
Tribler\Core\Session.py:432:start
lib\site-packages\twisted\internet\defer.py:321:addCallback
lib\site-packages\twisted\internet\defer.py:310:addCallbacks
--- <exception caught here> ---
lib\site-packages\twisted\internet\defer.py:653:_runCallbacks
Tribler\Core\Session.py:429:load_checkpoint
Tribler\Core\Session.py:384:load_checkpoint
Tribler\Core\APIImplementation\LaunchManyCore.py:570:load_checkpoint
Tribler\Core\APIImplementation\LaunchManyCore.py:567:do_load_checkpoint
Tribler\Core\APIImplementation\LaunchManyCore.py:599:resume_download
Tribler\Core\TorrentDef.py:115:load_from_dict
Tribler\Core\TorrentDef.py:68:__init__
]

# Fixed code
def render_GET(self, request):
    """
    .. http:get:: /search/completions?q=(string:query)

    A GET request to this endpoint will return autocompletion suggestions for the given query. For instance,
    when searching for "pioneer", this endpoint might return "pioneer one" if that torrent is present in the
    local database. This endpoint can be used to suggest terms to users while they type their search query.

        **Example request**:

        .. sourcecode:: none

            curl -X GET http://localhost:8085/search/completions?q=pioneer

        **Example response**:

        .. sourcecode:: javascript

            {
                "completions": ["pioneer one", "pioneer movie"]
            }
    """
    if "q" not in request.args:
        request.setResponseCode(http.BAD_REQUEST)
        return json.twisted_dumps({"error": "query parameter missing"})

    keywords = ensure_unicode(request.args[b"q"][0], "utf-8").lower()
    # TODO: add XXX filtering for completion terms
    results = self.session.lm.mds.TorrentMetadata.get_auto_complete_terms(
        keywords, max_terms=5
    )
    return json.twisted_dumps({"completions": results})