diff --git a/libdap2/ncd2dispatch.c b/libdap2/ncd2dispatch.c
index 6bc51100b3..226eef04c6 100644
--- a/libdap2/ncd2dispatch.c
+++ b/libdap2/ncd2dispatch.c
@@ -780,11 +780,45 @@ fprintf(stderr,"\n");
 	}
         var->ncid = varid;
 	if(var->attributes != NULL) {
+	    NCattribute* unsignedatt = NULL;
+	    int unsignedval = 0;
+	    /* See if variable has _Unsigned attribute */ 
 	    for(j=0;j<nclistlength(var->attributes);j++) {
 		NCattribute* att = (NCattribute*)nclistget(var->attributes,j);
+		if(strcmp(att->name,"_Unsigned") == 0) {
+		    char* value = nclistget(att->values,0);
+		    unsignedatt = att;
+		    if(value != NULL) {
+			if(strcasecmp(value,"false")==0
+			   || strcmp(value,"0")==0)
+			    unsignedval = 0;
+			else
+			    unsignedval = 1;
+		    }
+		    break;
+		}
+	    }
+	    for(j=0;j<nclistlength(var->attributes);j++) {
+		NCattribute* att = (NCattribute*)nclistget(var->attributes,j);
+		char* val = NULL;
 		/* Check for _FillValue/Variable mismatch */
 		if(strcmp(att->name,"_FillValue")==0) {
-		    if(att->etype != var->etype) {
+		    /* Special case var is byte, fillvalue is int16 and 
+			unsignedattr == 0;
+			This exception is needed because DAP2 byte type
+			is equivalent to netcdf ubyte type. So passing
+                        a signed byte thru DAP2 requires some type and
+                        signedness hacking that we have to undo.
+		    */
+		    if(var->etype == NC_UBYTE
+			&& att->etype == NC_SHORT
+			&& unsignedatt != NULL && unsignedval == 0) {
+			/* Forcibly change the attribute type and signedness */
+			att->etype = NC_BYTE;
+			val = nclistremove(unsignedatt->values,0);
+			if(val) free(val);
+			nclistpush(unsignedatt->values,strdup("false"));
+		    } else if(att->etype != var->etype) {/* other mismatches */
 			/* Log a message */
 	                nclog(NCLOGERR,"_FillValue/Variable type mismatch: variable=%s",var->ncbasename);
 			/* See if mismatch is allowed */
diff --git a/oc2/ochttp.c b/oc2/ochttp.c
index e6ae849c5d..70701c0b3f 100644
--- a/oc2/ochttp.c
+++ b/oc2/ochttp.c
@@ -138,6 +138,7 @@ ocfetchurl(CURL* curl, const char* url, NCbytes* buf, long* filetime)
 fail:
 	nclog(NCLOGERR, "curl error: %s", curl_easy_strerror(cstat));
 	switch (httpcode) {
+	case 400: stat = OC_EBADURL; break;
 	case 401: stat = OC_EAUTH; break;
 	case 404: stat = OC_ENOFILE; break;
 	case 500: stat = OC_EDAPSVC; break;