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webfs: use IOUNIT for transfer block size

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

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

@@ -28,7 +28,7 @@

 	int	tunnel;

 	int	len;

 	char	addr[128];

-	char	buf[8192+2];

+	char	buf[IOUNIT+2];

 };

 struct Hpool

@@ -549,7 +549,7 @@

 http(char *m, Url *u, Key *shdr, Buq *qbody, Buq *qpost)

 {

 	int i, l, n, try, pid, fd, cfd, needlength, chunked, retry, nobody, badauth;

-	char *s, *x, buf[8192+2], status[256], method[16], *host;

+	char *s, *x, buf[IOUNIT+2], status[256], method[16], *host;

 	vlong length, offset;

 	Url ru, tu, *nu;

 	Key *k, *rhdr;

@@ -625,7 +625,7 @@

 			/* have to read it to temp file to figure out the length */

 			if(fd >= 0 && needlength && lookkey(shdr, "Content-Length") == nil){

 				seek(fd, 0, 2);

-				while((n = buread(qpost, buf, sizeof(buf))) > 0)

+				while((n = buread(qpost, buf, sizeof(buf)-2)) > 0)

 					write(fd, buf, n);

 				shdr = delkey(shdr, "Transfer-Encoding");

 			}

@@ -1007,7 +1007,7 @@

 				offset = 0;

 			}

 			while(offset < length){

-				l = sizeof(buf);

+				l = sizeof(buf)-2;

 				if(l > (length - offset))

 					l = (length - offset);

 				if((n = hread(h, buf, l)) <= 0)