I created one POP3 receive location which sends the email to one orchestration. The message I use for this is a multipart message, one part is for the Attachment and the second part is for the body.
When I send an email with attachment everything goes fine. But when I send an email without attachment, even before I process the message, I get an exception:
Exception thrown from: segment 3, progress 3
Inner exception: The XLANG/s message has no part at index '1'. The total number of parts found in the message is '1'. If you expect a multipart message, check that the pipeline supports multipart messages such as MIME.
the message in the suspended message, contains of course one part (only the body) as there is no attachment.
Is there any way to handle it or filter the receive component in the orchestration?
Which is the configuration of your Receive Location? Seems that you have setted the Body Part Index property to 1 and according to the documentation:
Otherwise if the Body Part Index is set to a value greater than 0 and
the Body Part Content Type is blank, then the body part with the
specified index is selected as the BizTalk message body part. If the
specified index is greater than the number of body parts then the
message is suspended.
Read this document Processing Multi Part Messages with the POP3 Adapter, this can help you.
Related
Our system is accepting a text file upload and is supposed to have a pre-determined line count. If the line count doesn't match up, I want to send a warning of sorts back to the user asking to confirm that they want to upload anyway.
Is there a particular status code I can use for something like this?
You can use 422.
The 422 (Unprocessable Entity) status code means the server
understands the content type of the request entity (hence a
415(Unsupported Media Type) status code is inappropriate), and the
syntax of the request entity is correct (thus a 400 (Bad Request)
status code is inappropriate) but was unable to process the contained
instructions.
You can check this out.
rest API Tutorial - HTTP Status Codes
I have a simple orchestration which subscribes to a message, changes a status field in the message header then send back to the message box.
To test this I have hooked it up to a file location to accept an incoming XML message (as the system which will produce the message is not yet complete) and would then want the new message with the changed header sent to a new file location.
I can see the XML file disappearing as it is picked up, but I'm not clear on how to then output that to a new XML file. There are no maps involved so I'm unsure how to configure a send port to pick up from the message box.
You need to add a filter on send port based on some promoted properties of the message.
some example or filters: BTS.MessageType = "MessageType"
Once you add a filter in send port It will subscribe from the message box.
What HTTP status code should be sent to user if his post request is correct but there is nothing has been updated in database as user is sending the same value for every field which already been there in database?
A 200 status would definitely be perfectly appropriate in this case.
What you are describing is usually something that an application on top of the HTTP-based API would handle/add as context.
One lesser-known status code which could be used in such cases, however, is 204.
"The 204 (No Content) status code indicates that the server has
successfully fulfilled the request and that there is no additional
content to return in the response payload body"
In other words, depending on your application's setup, you could use a 204 (with no response body) to indicate that the PUT/update request itself was successful. but that nothing was modified.
See here for further reading on 204: https://datatracker.ietf.org/doc/html/draft-ietf-httpbis-p2-semantics-19#section-7.2.5
You will use 204 in this case.
The server has fulfilled the request but does not need to return an entity-body, and might want to return updated metainformation. The response MAY include new or updated metainformation in the form of entity-headers, which if present SHOULD be associated with the requested variant.
If the client is a user agent, it SHOULD NOT change its document view from that which caused the request to be sent. This response is primarily intended to allow input for actions to take place without causing a change to the user agent's active document view, although any new or updated metainformation SHOULD be applied to the document currently in the user agent's active view.
The 204 response MUST NOT include a message-body, and thus is always terminated by the first empty line after the header fields.
I am in reference to HttpServletResponse's sendError method:
void sendError(int sc,
java.lang.String msg)
throws java.io.IOException
... and the official documentation provided:
Sends an error response to the client using the specified status and
clears the buffer. The server defaults to creating the response to
look like an HTML-formatted server error page containing the specified
message, setting the content type to "text/html". The server will
preserve cookies and may clear or update any headers needed to serve
the error page as a valid response. If an error-page declaration has
been made for the web application corresponding to the status code
passed in, it will be served back in preference to the suggested msg
parameter and the msg parameter will be ignored.
If the response has
already been committed, this method throws an IllegalStateException.
After using this method, the response should be considered to be
committed and should not be written to.
Can anyone please explain what is meant by "clears the buffer" and "If the response has already been committed"?
what is meant by "clears the buffer"
The code will response.resetBuffer() which basically resets any written and unflushed data of response body.
and "If the response has already been committed"?
If the response headers are already sent to the client. This is a point of no return. The server cannot take back already sent data from the client and re-send a different response.
An example of the normal flow is as below:
user requests JSP
JSP writes some HTML to response body
some awkward code in midst of a JSP file throws an exception
server calls response.sendError(500) so that HTML of HTTP 500 error page will be written
user sees HTTP 500 error page
However, if between step 2 and 3 the response buffer is flushed (i.e. any so far written data gets actually sent from server to client), then the response is in a "committed" state. This cannot be resetted. The enduser basically ends up getting halfbaked HTML output representing the part until the point the exception has occurred.
That's also one of the reasons why doing business logic in a JSP file is a bad practice. See also a.o. How to avoid Java code in JSP files?
How do I handle a server error in the middle of an Http message?
Assuming I already sent the header of the message and I am streaming the
the body of the message, what do I do when I encounter an unexpected error.
I am also assuming this error was caused while generating the content and not a connection error.
(Greatly) Simplified Code:
// I can define any transfer encoding or header fields i need to.
send(header); // Sends the header to the Http client.
// Using an iterable instead of stream for code simplicity's sake.
Iterable<String> stream = getBodyStream();
Iterator<String> iterator = stream.iterator();
while (iterator.hasNext()) {
String string;
try {
string = iterator.next();
catch (Throwable error) { // Oops! an error generating the content.
// What do i do here? (In regards to the Http protocol)
}
send(string);
}
Is there a way to tell the client the server failed and should either retry or abandon the connection or am I sool?
The code is greatly simplified but I am only asking in regards to the protocol and not the exact code.
Thank You
One of the following should do it:
Close the connection (reset or normal close)
Write a malformed chunk (and close the connection) which will trigger client error
Add a http trailer telling your client that something went wrong.
Change your higher level protocol. Last piece of data you send is a hash or a length and the client knows to deal with it.
If you can generate a hash or a length (in a custom header if using http chunks) of your content before you start sending you can send it in a header so your client knows what to expect.
It depends on what you want your client to do with the data (keep it or throw it away). You may not be able to make changes on the client side so the last option will not work for example.
Here is some explanation about the different ways to close. TCP option SO_LINGER (zero) - when it's required.
I think the server should return a response code start with 5xx as per RFC 2616.
Server Error 5xx
Response status codes beginning with the digit "5" indicate cases in which the server is aware that it has erred or is incapable of performing the request. Except when responding to a HEAD request, the server SHOULD include an entity containing an explanation of the error situation, and whether it is a temporary or permanent condition. User agents SHOULD display any included entity to the user. These response codes are applicable to any request method.