Incorrent error message when parsing incorrent date-time format

When I have format: date-time in header 'Last-Modified': I got error message:

[ERROR] Unable to parse JSON - Unrecognized token 'Wed': was expecting ('true', 'false' or 'null')
     at [Source: Wed, 21 Jun 2017 14:59:37 GMT; line: 1, column: 4].

Specification example:

 "/users/me": {
      "get": {
        "tags": [
          "User"
        ],
        "summary": "Get user profile info",
        "operationId": "User_Get",
        "description": "Profile info and Last-Modified header.",
        "responses": {
          "200": {
            "description": "Profile info",
            "headers": {
              "Last-Modified": {
                "description": "Date profile modified",
                "type": "string",
                "format": "date-time"
              }
            },
            "schema": {
              "$ref": "#/definitions/User"
            }
          },
          "500": {
            "description": "Internal server error"
          }
        }
      }

According to swagger spec: date-time format is valid "yyyy-MM-dd'T'HH:mm:ssZ" format, but Last-Modified date format is "EEE, dd MMM yyyy HH:mm:ss zzz"

Expected result: Proper error handling when date-time from header not match as in spec

Actual result:

[ERROR] Unable to parse JSON - Unrecognized token 'Wed': was expecting ('true', 'false' or 'null')
     at [Source: Wed, 21 Jun 2017 14:59:37 GMT; line: 1, column: 4].

Additional Info: I know my swagger spec contain wrong date-time format, but it cause parsing error. When I delete format: date-time from swagger spec, all is OK.

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