# Buggy code
def main():
    argument_spec = url_argument_spec()
    argument_spec.update(
        url=dict(type="str", required=True),
        dest=dict(type="path", required=True),
        backup=dict(type="bool"),
        sha256sum=dict(type="str", default=""),
        checksum=dict(type="str", default=""),
        timeout=dict(type="int", default=10),
        headers=dict(type="raw"),
        tmp_dest=dict(type="path"),
    )

    module = AnsibleModule(
        # not checking because of daisy chain to file module
        argument_spec=argument_spec,
        add_file_common_args=True,
        supports_check_mode=True,
        mutually_exclusive=[["checksum", "sha256sum"]],
    )

    url = module.params["url"]
    dest = module.params["dest"]
    backup = module.params["backup"]
    force = module.params["force"]
    sha256sum = module.params["sha256sum"]
    checksum = module.params["checksum"]
    use_proxy = module.params["use_proxy"]
    timeout = module.params["timeout"]
    tmp_dest = module.params["tmp_dest"]

    # Parse headers to dict
    if isinstance(module.params["headers"], dict):
        headers = module.params["headers"]
    elif module.params["headers"]:
        try:
            headers = dict(
                item.split(":", 1) for item in module.params["headers"].split(",")
            )
            module.deprecate(
                "Supplying `headers` as a string is deprecated. Please use dict/hash format for `headers`",
                version="2.10",
            )
        except Exception:
            module.fail_json(
                msg="The string representation for the `headers` parameter requires a key:value,key:value syntax to be properly parsed."
            )
    else:
        headers = None

    dest_is_dir = os.path.isdir(dest)
    last_mod_time = None

    # workaround for usage of deprecated sha256sum parameter
    if sha256sum:
        checksum = "sha256:%s" % (sha256sum)

    # checksum specified, parse for algorithm and checksum
    if checksum:
        try:
            algorithm, checksum = checksum.split(":", 1)
            if (
                checksum.startswith("http://")
                or checksum.startswith("https://")
                or checksum.startswith("ftp://")
            ):
                checksum_url = checksum
                # download checksum file to checksum_tmpsrc
                checksum_tmpsrc, checksum_info = url_get(
                    module,
                    checksum_url,
                    dest,
                    use_proxy,
                    last_mod_time,
                    force,
                    timeout,
                    headers,
                    tmp_dest,
                )
                with open(checksum_tmpsrc) as f:
                    lines = [line.rstrip("\n") for line in f]
                os.remove(checksum_tmpsrc)
                lines = dict(s.split(None, 1) for s in lines)
                filename = url_filename(url)

                # Look through each line in the checksum file for a hash corresponding to
                # the filename in the url, returning the first hash that is found.
                for cksum in (
                    s for (s, f) in lines.items() if f.strip("./") == filename
                ):
                    checksum = cksum
                    break
                else:
                    checksum = None

                if checksum is None:
                    module.fail_json(
                        "Unable to find a checksum for file '%s' in '%s'"
                        % (filename, checksum_url)
                    )
            # Remove any non-alphanumeric characters, including the infamous
            # Unicode zero-width space
            checksum = re.sub(r"\W+", "", checksum).lower()
            # Ensure the checksum portion is a hexdigest
            int(checksum, 16)
        except ValueError:
            module.fail_json(
                msg="The checksum parameter has to be in format <algorithm>:<checksum>"
            )

    if not dest_is_dir and os.path.exists(dest):
        checksum_mismatch = False

        # If the download is not forced and there is a checksum, allow
        # checksum match to skip the download.
        if not force and checksum != "":
            destination_checksum = module.digest_from_file(dest, algorithm)

            if checksum != destination_checksum:
                checksum_mismatch = True

        # Not forcing redownload, unless checksum does not match
        if not force and not checksum_mismatch:
            # Not forcing redownload, unless checksum does not match
            # allow file attribute changes
            module.params["path"] = dest
            file_args = module.load_file_common_arguments(module.params)
            file_args["path"] = dest
            changed = module.set_fs_attributes_if_different(file_args, False)
            if changed:
                module.exit_json(
                    msg="file already exists but file attributes changed",
                    dest=dest,
                    url=url,
                    changed=changed,
                )
            module.exit_json(
                msg="file already exists", dest=dest, url=url, changed=changed
            )

        # If the file already exists, prepare the last modified time for the
        # request.
        mtime = os.path.getmtime(dest)
        last_mod_time = datetime.datetime.utcfromtimestamp(mtime)

        # If the checksum does not match we have to force the download
        # because last_mod_time may be newer than on remote
        if checksum_mismatch:
            force = True

    # download to tmpsrc
    tmpsrc, info = url_get(
        module, url, dest, use_proxy, last_mod_time, force, timeout, headers, tmp_dest
    )

    # Now the request has completed, we can finally generate the final
    # destination file name from the info dict.

    if dest_is_dir:
        filename = extract_filename_from_headers(info)
        if not filename:
            # Fall back to extracting the filename from the URL.
            # Pluck the URL from the info, since a redirect could have changed
            # it.
            filename = url_filename(info["url"])
        dest = os.path.join(dest, filename)

    checksum_src = None
    checksum_dest = None

    # raise an error if there is no tmpsrc file
    if not os.path.exists(tmpsrc):
        os.remove(tmpsrc)
        module.fail_json(
            msg="Request failed", status_code=info["status"], response=info["msg"]
        )
    if not os.access(tmpsrc, os.R_OK):
        os.remove(tmpsrc)
        module.fail_json(msg="Source %s is not readable" % (tmpsrc))
    checksum_src = module.sha1(tmpsrc)

    # check if there is no dest file
    if os.path.exists(dest):
        # raise an error if copy has no permission on dest
        if not os.access(dest, os.W_OK):
            os.remove(tmpsrc)
            module.fail_json(msg="Destination %s is not writable" % (dest))
        if not os.access(dest, os.R_OK):
            os.remove(tmpsrc)
            module.fail_json(msg="Destination %s is not readable" % (dest))
        checksum_dest = module.sha1(dest)
    else:
        if not os.path.exists(os.path.dirname(dest)):
            os.remove(tmpsrc)
            module.fail_json(
                msg="Destination %s does not exist" % (os.path.dirname(dest))
            )
        if not os.access(os.path.dirname(dest), os.W_OK):
            os.remove(tmpsrc)
            module.fail_json(
                msg="Destination %s is not writable" % (os.path.dirname(dest))
            )

    if module.check_mode:
        if os.path.exists(tmpsrc):
            os.remove(tmpsrc)
        changed = checksum_dest is None or checksum_src != checksum_dest
        res_args = dict(
            url=url,
            changed=changed,
            dest=dest,
            src=tmpsrc,
            checksum_dest=checksum_dest,
            checksum_src=checksum_src,
            msg=info.get("msg", ""),
        )
        module.exit_json(**res_args)

    backup_file = None
    if checksum_src != checksum_dest:
        try:
            if backup:
                if os.path.exists(dest):
                    backup_file = module.backup_local(dest)
            module.atomic_move(tmpsrc, dest)
        except Exception as e:
            if os.path.exists(tmpsrc):
                os.remove(tmpsrc)
            module.fail_json(
                msg="failed to copy %s to %s: %s" % (tmpsrc, dest, to_native(e)),
                exception=traceback.format_exc(),
            )
        changed = True
    else:
        changed = False
        if os.path.exists(tmpsrc):
            os.remove(tmpsrc)

    if checksum != "":
        destination_checksum = module.digest_from_file(dest, algorithm)

        if checksum != destination_checksum:
            os.remove(dest)
            module.fail_json(
                msg="The checksum for %s did not match %s; it was %s."
                % (dest, checksum, destination_checksum)
            )

    # allow file attribute changes
    module.params["path"] = dest
    file_args = module.load_file_common_arguments(module.params)
    file_args["path"] = dest
    changed = module.set_fs_attributes_if_different(file_args, changed)

    # Backwards compat only.  We'll return None on FIPS enabled systems
    try:
        md5sum = module.md5(dest)
    except ValueError:
        md5sum = None

    res_args = dict(
        url=url,
        dest=dest,
        src=tmpsrc,
        md5sum=md5sum,
        checksum_src=checksum_src,
        checksum_dest=checksum_dest,
        changed=changed,
        msg=info.get("msg", ""),
        status_code=info.get("status", ""),
    )
    if backup_file:
        res_args["backup_file"] = backup_file

    # Mission complete
    module.exit_json(**res_args)


# Traceback (nTypeError)
FAILED! => {"changed": false, "module_stderr": "Shared connection to test.internal.pcfe.net closed.\r\n", "module_stdout": "Traceback (most recent call last):\r\n  File \"/home/ansible/.ansible/tmp/ansible-tmp-1542361761.7009695-40128962622448/AnsiballZ_get_url.py\", line 113, in <module>\r\n    _ansiballz_main()\r\n  File \"/home/ansible/.ansible/tmp/ansible-tmp-1542361761.7009695-40128962622448/AnsiballZ_get_url.py\", line 105, in _ansiballz_main\r\n    invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)\r\n  File \"/home/ansible/.ansible/tmp/ansible-tmp-1542361761.7009695-40128962622448/AnsiballZ_get_url.py\", line 48, in invoke_module\r\n    imp.load_module('__main__', mod, module, MOD_DESC)\r\n  File \"/tmp/ansible_get_url_payload_oCXwt5/__main__.py\", line 607, in <module>\r\n  File \"/tmp/ansible_get_url_payload_oCXwt5/__main__.py\", line 465, in main\r\nTypeError: fail_json() takes exactly 1 argument (2 given)\r\n", "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error", "rc": 1}

# Fixed code
def main():
    argument_spec = url_argument_spec()
    argument_spec.update(
        url=dict(type="str", required=True),
        dest=dict(type="path", required=True),
        backup=dict(type="bool"),
        sha256sum=dict(type="str", default=""),
        checksum=dict(type="str", default=""),
        timeout=dict(type="int", default=10),
        headers=dict(type="raw"),
        tmp_dest=dict(type="path"),
    )

    module = AnsibleModule(
        # not checking because of daisy chain to file module
        argument_spec=argument_spec,
        add_file_common_args=True,
        supports_check_mode=True,
        mutually_exclusive=[["checksum", "sha256sum"]],
    )

    url = module.params["url"]
    dest = module.params["dest"]
    backup = module.params["backup"]
    force = module.params["force"]
    sha256sum = module.params["sha256sum"]
    checksum = module.params["checksum"]
    use_proxy = module.params["use_proxy"]
    timeout = module.params["timeout"]
    tmp_dest = module.params["tmp_dest"]

    # Parse headers to dict
    if isinstance(module.params["headers"], dict):
        headers = module.params["headers"]
    elif module.params["headers"]:
        try:
            headers = dict(
                item.split(":", 1) for item in module.params["headers"].split(",")
            )
            module.deprecate(
                "Supplying `headers` as a string is deprecated. Please use dict/hash format for `headers`",
                version="2.10",
            )
        except Exception:
            module.fail_json(
                msg="The string representation for the `headers` parameter requires a key:value,key:value syntax to be properly parsed."
            )
    else:
        headers = None

    dest_is_dir = os.path.isdir(dest)
    last_mod_time = None

    # workaround for usage of deprecated sha256sum parameter
    if sha256sum:
        checksum = "sha256:%s" % (sha256sum)

    # checksum specified, parse for algorithm and checksum
    if checksum:
        try:
            algorithm, checksum = checksum.split(":", 1)
        except ValueError:
            module.fail_json(
                msg="The checksum parameter has to be in format <algorithm>:<checksum>"
            )

        if (
            checksum.startswith("http://")
            or checksum.startswith("https://")
            or checksum.startswith("ftp://")
        ):
            checksum_url = checksum
            # download checksum file to checksum_tmpsrc
            checksum_tmpsrc, checksum_info = url_get(
                module,
                checksum_url,
                dest,
                use_proxy,
                last_mod_time,
                force,
                timeout,
                headers,
                tmp_dest,
            )
            with open(checksum_tmpsrc) as f:
                lines = [line.rstrip("\n") for line in f]
            os.remove(checksum_tmpsrc)
            checksum_map = {}
            for line in lines:
                parts = line.split(None, 1)
                if len(parts) == 2:
                    checksum_map[parts[0]] = parts[1]
            filename = url_filename(url)

            # Look through each line in the checksum file for a hash corresponding to
            # the filename in the url, returning the first hash that is found.
            for cksum in (
                s for (s, f) in checksum_map.items() if f.strip("./") == filename
            ):
                checksum = cksum
                break
            else:
                checksum = None

            if checksum is None:
                module.fail_json(
                    msg="Unable to find a checksum for file '%s' in '%s'"
                    % (filename, checksum_url)
                )
        # Remove any non-alphanumeric characters, including the infamous
        # Unicode zero-width space
        checksum = re.sub(r"\W+", "", checksum).lower()
        # Ensure the checksum portion is a hexdigest
        try:
            int(checksum, 16)
        except ValueError:
            module.fail_json(msg="The checksum format is invalid")

    if not dest_is_dir and os.path.exists(dest):
        checksum_mismatch = False

        # If the download is not forced and there is a checksum, allow
        # checksum match to skip the download.
        if not force and checksum != "":
            destination_checksum = module.digest_from_file(dest, algorithm)

            if checksum != destination_checksum:
                checksum_mismatch = True

        # Not forcing redownload, unless checksum does not match
        if not force and not checksum_mismatch:
            # Not forcing redownload, unless checksum does not match
            # allow file attribute changes
            module.params["path"] = dest
            file_args = module.load_file_common_arguments(module.params)
            file_args["path"] = dest
            changed = module.set_fs_attributes_if_different(file_args, False)
            if changed:
                module.exit_json(
                    msg="file already exists but file attributes changed",
                    dest=dest,
                    url=url,
                    changed=changed,
                )
            module.exit_json(
                msg="file already exists", dest=dest, url=url, changed=changed
            )

        # If the file already exists, prepare the last modified time for the
        # request.
        mtime = os.path.getmtime(dest)
        last_mod_time = datetime.datetime.utcfromtimestamp(mtime)

        # If the checksum does not match we have to force the download
        # because last_mod_time may be newer than on remote
        if checksum_mismatch:
            force = True

    # download to tmpsrc
    tmpsrc, info = url_get(
        module, url, dest, use_proxy, last_mod_time, force, timeout, headers, tmp_dest
    )

    # Now the request has completed, we can finally generate the final
    # destination file name from the info dict.

    if dest_is_dir:
        filename = extract_filename_from_headers(info)
        if not filename:
            # Fall back to extracting the filename from the URL.
            # Pluck the URL from the info, since a redirect could have changed
            # it.
            filename = url_filename(info["url"])
        dest = os.path.join(dest, filename)

    checksum_src = None
    checksum_dest = None

    # raise an error if there is no tmpsrc file
    if not os.path.exists(tmpsrc):
        os.remove(tmpsrc)
        module.fail_json(
            msg="Request failed", status_code=info["status"], response=info["msg"]
        )
    if not os.access(tmpsrc, os.R_OK):
        os.remove(tmpsrc)
        module.fail_json(msg="Source %s is not readable" % (tmpsrc))
    checksum_src = module.sha1(tmpsrc)

    # check if there is no dest file
    if os.path.exists(dest):
        # raise an error if copy has no permission on dest
        if not os.access(dest, os.W_OK):
            os.remove(tmpsrc)
            module.fail_json(msg="Destination %s is not writable" % (dest))
        if not os.access(dest, os.R_OK):
            os.remove(tmpsrc)
            module.fail_json(msg="Destination %s is not readable" % (dest))
        checksum_dest = module.sha1(dest)
    else:
        if not os.path.exists(os.path.dirname(dest)):
            os.remove(tmpsrc)
            module.fail_json(
                msg="Destination %s does not exist" % (os.path.dirname(dest))
            )
        if not os.access(os.path.dirname(dest), os.W_OK):
            os.remove(tmpsrc)
            module.fail_json(
                msg="Destination %s is not writable" % (os.path.dirname(dest))
            )

    if module.check_mode:
        if os.path.exists(tmpsrc):
            os.remove(tmpsrc)
        changed = checksum_dest is None or checksum_src != checksum_dest
        res_args = dict(
            url=url,
            changed=changed,
            dest=dest,
            src=tmpsrc,
            checksum_dest=checksum_dest,
            checksum_src=checksum_src,
            msg=info.get("msg", ""),
        )
        module.exit_json(**res_args)

    backup_file = None
    if checksum_src != checksum_dest:
        try:
            if backup:
                if os.path.exists(dest):
                    backup_file = module.backup_local(dest)
            module.atomic_move(tmpsrc, dest)
        except Exception as e:
            if os.path.exists(tmpsrc):
                os.remove(tmpsrc)
            module.fail_json(
                msg="failed to copy %s to %s: %s" % (tmpsrc, dest, to_native(e)),
                exception=traceback.format_exc(),
            )
        changed = True
    else:
        changed = False
        if os.path.exists(tmpsrc):
            os.remove(tmpsrc)

    if checksum != "":
        destination_checksum = module.digest_from_file(dest, algorithm)

        if checksum != destination_checksum:
            os.remove(dest)
            module.fail_json(
                msg="The checksum for %s did not match %s; it was %s."
                % (dest, checksum, destination_checksum)
            )

    # allow file attribute changes
    module.params["path"] = dest
    file_args = module.load_file_common_arguments(module.params)
    file_args["path"] = dest
    changed = module.set_fs_attributes_if_different(file_args, changed)

    # Backwards compat only.  We'll return None on FIPS enabled systems
    try:
        md5sum = module.md5(dest)
    except ValueError:
        md5sum = None

    res_args = dict(
        url=url,
        dest=dest,
        src=tmpsrc,
        md5sum=md5sum,
        checksum_src=checksum_src,
        checksum_dest=checksum_dest,
        changed=changed,
        msg=info.get("msg", ""),
        status_code=info.get("status", ""),
    )
    if backup_file:
        res_args["backup_file"] = backup_file

    # Mission complete
    module.exit_json(**res_args)