func (c *conn) Respond(status int, header web.StringsMap) (body web.ResponseBody) {
if c.hijacked {
log.Stderr("twister: Respond called on hijacked connection")
return nil
}
if c.respondCalled {
log.Stderr("twister: multiple calls to Respond")
return nil
}
c.respondCalled = true
c.requestErr = web.ErrInvalidState
if _, found := header.Get(web.HeaderTransferEncoding); found {
log.Stderr("twister: transfer encoding not allowed")
header[web.HeaderTransferEncoding] = nil, false
}
if c.requestAvail > 0 {
c.closeAfterResponse = true
}
c.chunked = true
c.responseAvail = 0
if status == web.StatusNotModified {
header[web.HeaderContentType] = nil, false
header[web.HeaderContentLength] = nil, false
c.chunked = false
} else if s, found := header.Get(web.HeaderContentLength); found {
c.responseAvail, _ = strconv.Atoi(s)
c.chunked = false
} else if c.req.ProtocolVersion < web.ProtocolVersion(1, 1) {
c.closeAfterResponse = true
}
if c.closeAfterResponse {
header.Set(web.HeaderConnection, "close")
c.chunked = false
}
if c.chunked {
header.Set(web.HeaderTransferEncoding, "chunked")
}
proto := "HTTP/1.0"
if c.req.ProtocolVersion >= web.ProtocolVersion(1, 1) {
proto = "HTTP/1.1"
}
statusString := strconv.Itoa(status)
text, found := web.StatusText[status]
if !found {
text = "status code " + statusString
}
var b bytes.Buffer
b.WriteString(proto)
b.WriteString(" ")
b.WriteString(statusString)
b.WriteString(" ")
b.WriteString(text)
b.WriteString("\r\n")
for key, values := range header {
for _, value := range values {
b.WriteString(key)
b.WriteString(": ")
b.WriteString(cleanHeaderValue(value))
b.WriteString("\r\n")
}
}
b.WriteString("\r\n")
if c.chunked {
c.bw = bufio.NewWriter(chunkedWriter{c})
_, c.responseErr = c.netConn.Write(b.Bytes())
} else {
c.bw = bufio.NewWriter(identityWriter{c})
c.bw.Write(b.Bytes())
}
return c.bw
}
