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webfs: less aggressive url normalization; never unescape reserved characters in path/query/fragment

--- a/sys/src/cmd/webfs/url.c

+++ b/sys/src/cmd/webfs/url.c

@@ -8,6 +8,8 @@

 #include "dat.h"

 #include "fns.h"

+static char reserved[] = "%:/?#[]@!$&'()*+,;=";

+

 static int

 dhex(char c)

 {

@@ -31,7 +33,7 @@

 	for(r=w=s; x = *r; r++){

 		if(x == '%' && isxdigit(r[1]) && isxdigit(r[2])){

 			x = (dhex(r[1])<<4)|dhex(r[2]);

-			if(x == 0 || x == '%' || (x > 0x1F && x < 0x7F && strchr(spec, x))){

+			if(spec && strchr(spec, x)){

 				*w++ = '%';

 				*w++ = toupper(r[1]);

 				*w++ = toupper(r[2]);

@@ -328,11 +330,11 @@

 		free(t);

 	}

-	unescape(u->user, "");

-	unescape(u->pass, "");

-	unescape(u->path, "/");

-	unescape(u->query, "&;=/?#");

-	unescape(u->fragment, "");

+	unescape(u->user, nil);

+	unescape(u->pass, nil);

+	unescape(u->path, reserved);

+	unescape(u->query, reserved);

+	unescape(u->fragment, reserved);

 	mklowcase(u->scheme);

 	mklowcase(u->host);

 	mklowcase(u->port);

-- 

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