Allow requests without queries

Apply a stylesheet to <pgx:no_query /> in that case.

This is slightly out of the project scope, but handy in some
cases (helps to avoid dummy queries or additional software), and done
with a single line change.

2 files changed, 5 insertions, 1 deletions

diff --git a/Main.hsc b/Main.hsc
index 3c247de..47a4366 100644
--- a/Main.hsc
+++ b/Main.hsc
@@ -301,7 +301,7 @@ serve xsltDirectory ioc ps = case lookup "q" ps of
         if pNeeded || pUsed
           then requireAuth
           else redb 500 [("message", "Database connection failed")]
-  _ -> respError 418 [("message", "No query is provided")]
+  _ -> resp 200 "<no_query xmlns=\"urn:x-pgxhtml\" />"
   where
     xsltPath = xsltDirectory </>
                takeFileName (BS.unpack $ fromMaybe "default" $ lookup "t" ps)
diff --git a/example/common.xsl b/example/common.xsl
index 15838ba..c832552 100644
--- a/example/common.xsl
+++ b/example/common.xsl
@@ -41,4 +41,8 @@
     <dd><xsl:copy-of select="text()" /></dd>
   </xsl:template>
 
+  <xsl:template match="pgx:no_query">
+    <p>No query is provided.</p>
+  </xsl:template>
+
 </xsl:stylesheet>