PUT requests to LogStash fail when sent using HttpClient, succeed when sent using cURL - rest

Question

Here is my logstash.conf file. (Apologies for not pasting the code here directly; StackOverflow does not allow posts exceeding a certain code-to-text ratio.)
My remote VM, which also hosts my ElasticSearch and LogStash servers, listens on Port 8080.
On my local machine, I periodically send zipped folders (containing JSON documents) over TCP to my remote server, which receives the data into a memory stream, unzips the folders, and sends the contents to LogStash. LogStash in turn forwards the data to ElasticSearch.
I am currently testing the workflow with some dummy data.
On my remote server, here is the method for receiving data over TCP:
private static void ReceiveAndUnzipElasticSearchDocumentFolder(int numBytesExpectedToReceive)
{
int numBytesLeftToReceive = numBytesExpectedToReceive;
using (MemoryStream zippedFolderStream = new MemoryStream(new byte[numBytesExpectedToReceive]))
{
while (numBytesLeftToReceive > 0)
{
// Receive data in small packets
}
zippedFolderStream.Unzip(afterReadingEachDocument: LogStashDataSender.Send);
}
}
Here is the code for unzipping the received folder:
public static class StreamExtensions
{
public static void Unzip(this Stream zippedElasticSearchDocumentFolderStream, Action<ElasticSearchJsonDocument> afterReadingEachDocument)
{
JsonSerializer jsonSerializer = new JsonSerializer();
foreach (ZipArchiveEntry entry in new ZipArchive(zippedElasticSearchDocumentFolderStream).Entries)
{
using (JsonTextReader jsonReader = new JsonTextReader(new StreamReader(entry.Open())))
{
dynamic jsonObject = jsonSerializer.Deserialize<ExpandoObject>(jsonReader);
string jsonIndexId = jsonObject.IndexId;
string jsonDocumentId = jsonObject.DocumentId;
afterReadingEachDocument(new ElasticSearchJsonDocument(jsonObject, jsonIndexId, jsonDocumentId));
}
}
}
}
And here is the method for sending data to LogStash:
public static async void Send(ElasticSearchJsonDocument document)
{
HttpResponseMessage response =
await httpClient.PutAsJsonAsync(
IsNullOrWhiteSpace(document.DocumentId)
? $"{document.IndexId}"
: $"{document.IndexId}/{document.DocumentId}",
document.JsonObject);
try
{
response.EnsureSuccessStatusCode();
}
catch (Exception exception)
{
Console.WriteLine(exception.Message);
}
Console.WriteLine($"{response.Content}");
}
The httpClient referenced in the public static async void Send(ElasticSearchJsonDocument document) method was created using the following code:
private const string LogStashHostAddress = "http://127.0.0.1";
private const int LogStashPort = 31311;
httpClient = new HttpClient { BaseAddress = new Uri($"{LogStashHostAddress}:{LogStashPort}/") };
httpClient.DefaultRequestHeaders.Accept.Clear();
httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
When I step into a new debug instance, the program runs smoothly, but dies immediately after executing await httpClient.PutAsJsonAsync for each of the documents contained inside the zipped folder -- response.EnsureSuccessStatusCode(); is never hit; neither is Console.WriteLine(exception.Message); nor Console.WriteLine($"{response.Content}");.
Here is an example of ElasticSearchJsonDocument that is passed to the public static async void Send(ElasticSearchJsonDocument document) method:
When I ran the same PUT request using cURL, the Book index was successfully created, and I could then a GET request to retrieve the data from ElasticSearch.
My questions are:
Why did the program die immediately (with no visible exception messages) after executing await httpClient.PutAsJsonAsync(...) for each of the JSON document inside the received zipped folder?
What changes should I make to ensure that I can make successful PUT requests to LogStash using a HttpClient instance?

Answer 1

I changed my httpClient instantiation code from
httpClient = new HttpClient { BaseAddress = new Uri($"{LogStashHostAddress}:{LogStashPort}/") };
httpClient.DefaultRequestHeaders.Accept.Clear();
httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
to
httpClient = new HttpClient();
httpClient.DefaultRequestHeaders.Accept.Clear();
httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
And I changed await http.Client.PutAsJsonAsync(...) to
HttpResponseMessage response =
await httpClient.PutAsJsonAsync(
IsNullOrWhiteSpace(document.DocumentId)
? $"{LogStashHostAddress}:{LogStashPort}/{document.IndexId}"
: $"{LogStashHostAddress}:{LogStashPort}/{document.IndexId}/{document.DocumentId}",
document.JsonObject);
response.EnsureSuccessStatusCode();
It turns out that the BaseAddress field in HttpClient is extremely user-unfriendly, so instead of wasting more time on it, I decided to just eliminate it entirely.