// Returns the request offset into the builder buffer
public UInt32 Build(ByteBuilder builder, HttpClient client, Boolean keepAlive)
{
if (method == null)
{
throw new InvalidOperationException("The HttpRequest method must be set");
}
//
// <METHOD> <resource> HTTP/1.1\r\n
//
builder.AppendAscii(method); // Todo: Should I verify that method is ascii beforehand?
builder.AppendAscii(' ');
if (!String.IsNullOrEmpty(resource))
{
builder.AppendAscii(resource); // Todo: Should I verify that resource is ascii beforehand?
}
else if (resourceAppender != null)
{
resourceAppender(builder);
}
else
{
throw new InvalidOperationException("The HttpRequest resource must be set");
}
builder.Append(VersionPart);
//
// Host: <host>[:<port>]
//
builder.Append(Http.HostHeaderPrefix);
if (overrideHostHeader != null)
{
builder.AppendAscii(overrideHostHeader);
}
else
{
builder.AppendAscii(client.IPOrHost);
if (client.Port != 80 || forcePortInHostHeader)
{
builder.AppendAscii(':');
builder.AppendNumber(client.Port, 10);
}
}
builder.Append(Http.Newline);
//
// Header: Content-Length
//
// TODO: when do I not need a Content-Length?
UInt32 contentLengthOffset = UInt32.MaxValue;
{
Boolean hasContent;
UInt32 contentLength;
if (content.contentAsBytes != null)
{
hasContent = true;
contentLength = (UInt32)content.contentAsBytes.Length;
}
else if (content.contentAsString != null)
{
hasContent = true;
contentLength = content.contentAsStringEncoder.GetEncodeLength(content.contentAsString);
}
else if (content.contentAppender != null)
{
hasContent = true;
contentLength = UInt32.MaxValue; // Placeholder
}
else
{
hasContent = false;
contentLength = 0;
}
if (hasContent)
{
builder.Append(Http.ContentLengthHeaderPrefix);
contentLengthOffset = builder.contentLength;
builder.AppendNumber(contentLength);
builder.Append(Http.Newline);
if (content.contentType != null)
{
builder.Append(Http.ContentTypeHeaderPrefix);
builder.AppendAscii(content.contentType);
builder.Append(Http.Newline);
}
}
}
//
// Header: Connection
//
if (keepAlive)
{
builder.Append(Http.ConnectionHeaderPrefix);
builder.Append(Http.ConnectionKeepAlive);
builder.Append(Http.Newline);
}
else
{
builder.Append(Http.ConnectionHeaderPrefix);
builder.Append(Http.ConnectionClose);
builder.Append(Http.Newline);
}
//
// Extra Headers
//
if (extraHeaders != null)
{
builder.Append(extraHeaders);
}
if (extraHeadersAppender != null)
{
extraHeadersAppender(builder);
}
//
// End of Headers \r\n\r\n
//
builder.Append(Http.Newline);
//
// Content
//
if (content.contentAsBytes != null)
{
builder.Append(content.contentAsBytes);
}
else if (content.contentAsString != null)
{
builder.Append(content.contentAsStringEncoder, content.contentAsString);
}
else if (content.contentAppender != null)
{
//
// Get the content
//
var contentStart = builder.contentLength;
content.contentAppender(builder);
UInt32 contentLength = builder.contentLength - contentStart;
// Patch the request with the new content length
UInt32 shift; // Shift everything before Content-Length: value to the right
if (contentLength == 0)
{
builder.bytes[contentLengthOffset + 9] = (Byte)'0';
shift = 9; // Shift everything
}
else
{
shift = 9;
var temp = contentLength;
while (true)
{
builder.bytes[contentLengthOffset + shift] = (Byte)('0' + (temp % 10));
temp = temp / 10;
if (temp == 0)
{
break;
}
shift--;
}
}
// Shift the beginning of the request to compensate for a smaller Content-Length
if (shift > 0)
{
var offset = contentLengthOffset - 1;
while (true)
{
builder.bytes[offset + shift] = builder.bytes[offset];
if (offset == 0)
{
break;
}
offset--;
}
}
return(shift);
}
return(0);
}