How to get multi-part form file from the http request?

[tjliupeng]

Hi, guys,

I want to use the workflow to build a RESTful server which can receiver image file from client and do some AI works. As the title says, how to get multi-part form file from the http request? Can you share a code example?

Thanks!

[Barenboim]

You means splitting query of URI? Like http://.../?a=1&b=2c=3...
Maybe URIParser will help you.

[tjliupeng]

@Barenboim , URI Like http://.../?a=1&b=2c=3 is usually the query parameter in URL for GET method. What I mean is the file attachment in the http request. You can think about the scenario which an image file was sent to the server, and the server need to save the file.

[Barenboim]

Sorry, we don't parse multi-part form of http message automatically. So you may get the message body, and parse it by yourself.
Example:
void process(WFHttpTask *task)
{
const void *body;
size_t size;
task->get_req()->get_parsed_body(&body, &size);
// parse body here
...
}
get_parsed_body() is an method of protocol::HttpMessage。BTW, this interface does NOT decode chunk encoding, it returns the orginal http message body.

[Barenboim]

To decode chunked body, you may use HttpUtil::decode_chunked_body in HttpUtil. Or use HttpChunkCursor to decode chunks with zero-copy.

[Barenboim]

https://github.com/BDZNH/workflow-HttpFormdataParser

[Barenboim]

@tjliupeng
Restful web framework based on workflow: https://github.com/wfrest/wfrest

[tjliupeng]

Nice.

[Jamishon]

int state = task->get_state();

    if (state == WFT_STATE_SUCCESS)
    {
        protocol::HttpResponse* response = task->get_resp();

        const void* body;
        size_t len;

        response->get_parsed_body(&body, &len);

        char* resp_body = new char[len + 1];
        memset(resp_body, 0, len + 1);
}

I use the snap code above to the http Post response, response data is to much, but the maxmium len is always 380696, I use the tool Postman it return the all data, how can I get the rest data or there is a bug on the reponse data buffer .