Backslash is not allowed by Tomcat in URLs by default

By default tomcat return a ERROR 400 bad request, if there is backslah (antislash) in the URL. See here :
public class CoyoteAdapter implements Adapter {
protected static final boolean ALLOW_BACKSLASH =
Boolean.valueOf(System.getProperty("org.apache.catalina.connector.CoyoteAdapter.ALLOW_BACKSLASH", "false")).booleanValue();
...

public static boolean normalize(MessageBytes uriMB) {
...

for (pos = start; pos < end; pos++) {
if (b[pos] == (byte) '
') {
if (ALLOW_BACKSLASH)

{ b[pos] = (byte) '/'; }

else

{ return false; }

So backslash will be forbidden into a document name (as it is used into the path, used for the URL). and will be replaced by a minus character.