[chore] transport improvements (#1524)

* improve error readability, mark "bad hosts" as fastFail

Signed-off-by: kim <grufwub@gmail.com>

* pull in latest go-byteutil version with byteutil.Reader{}

Signed-off-by: kim <grufwub@gmail.com>

* use rewindable body reader for post requests

Signed-off-by: kim <grufwub@gmail.com>

---------

Signed-off-by: kim <grufwub@gmail.com>

vendor/codeberg.org/gruf/go-byteutil/reader.go

@@ -0,0 +1,36 @@
+package byteutil
+
+import "bytes"
+
+// Reader wraps a bytes.Reader{} to provide Rewind() capabilities.
+type Reader struct {
+	B []byte
+	bytes.Reader
+}
+
+// NewReader returns a new Reader{} instance reset to b.
+func NewReader(b []byte) *Reader {
+	r := &Reader{}
+	r.Reset(b)
+	return r
+}
+
+// Reset resets the Reader{} to be reading from b and sets Reader{}.B.
+func (r *Reader) Reset(b []byte) {
+	r.B = b
+	r.Rewind()
+}
+
+// Rewind resets the Reader{} to be reading from the start of Reader{}.B.
+func (r *Reader) Rewind() {
+	r.Reader.Reset(r.B)
+}
+
+// ReadNopCloser wraps a Reader{} to provide nop close method.
+type ReadNopCloser struct {
+	Reader
+}
+
+func (*ReadNopCloser) Close() error {
+	return nil
+}