https://issues.apache.org/bugzilla/show_bug.cgi?id=55576
Bug ID: 55576
Summary: Order of ServletRequest parameters is not preserved
Product: Tomcat 7
Version: 7.0.35
Hardware: PC
Status: NEW
Severity: major
Priority: P2
Component: Servlet & JSP API
Assignee: dev@tomcat.apache.org
Reporter: corythearchit...@outlook.com
The ServletRequest interface provides two methods to iterate through request
parameters:
Enumeration<String> getParameterNames(), and
Map<String, String[]> getParameterMap()
Unfortunately, the underlying implementation in Tomcat is a HashMap, which
fails to preserve the order of parameters as they are specified in the request.
An alternate implementation should be used to preserve request order.
LinkedHashMap, for example, is capable of preserving insertion order.
The Servlet Specification (v3.0) speaks only to the relative ordering of query
string data and post body data. However, section 17.13.3 of the HTML
specification (v4.01) titled "Processing form data", clearly states that
"control names/values are listed in the order they appear in the document."
Therefore, I do not see a valid interpretation of either specification to
rationalize Tomcat's implementation. To receive a request with an ordered list
of parameters and represent them in an implementation that is guaranteed not to
preserve this order is difficult to rationalize.
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