Error 400 using download link from embedded code

terryz No, the values there appear to be valid, and nothing seems to be missing when compared to a curl sample. The only thing that looks off is that the whole URL is output under a description of "requestParams.method", but that may just be how the client is formatting its logging; it may not be representative of how it is actually formatting the real HTTP request it is sending. (The actual start line of the HTTP request should look like "GET /s/y5jlwu5nfr3s8xe/FAULTMSG.CSV?dl=1 HTTP/1.1"; and the "method" is just the "GET" part.)

The generic 400 HTML error page you're getting can be returned when the HTTP request itself is malformed, even if the intended header values themselves would be correct. For example, we've seen this when a client malforms a request by accidentally sending an extra blank line (thereby ending the headers section) before sending the rest of the actual headers. That sort of corruption may not be apparent from the client-side logging though unfortunately.

In order to simplify this in the hopes of eliminating the corruption, have you tried running your code without setting the headers yourself? You don't need to mimic a browser anyway, and the client may automatically set the header(s) that are needed (e.g., "Host").