Protocols overview

Quick reference for HTTP, SOAP, WebSocket, GraphQL, gRPC, SSE, and AI Chat in Testnizer.

Testnizer treats every protocol as a first-class request type, not a plugin or add-on. Each one has a dedicated editor, dedicated response panel, and dedicated engine in the Node main process.

At a glance

Protocol	Editor	Engine	Notes
HTTP / REST	full	axios	Methods, body modes, mTLS, scripts, assertions
SOAP	full	soap library + wsse	WSDL import, manual envelope, WS-Security
WebSocket	full	ws	wss + custom headers + JSON composer
GraphQL	full	graphql + graphql-ws	Query + mutation + subscription
gRPC	full	@grpc/grpc-js + @grpc/proto-loader	All four streaming modes
SSE	full	eventsource	Long-lived streams, Last-Event-ID resume
AI Chat	full	provider-specific HTTP	14 providers + custom URL, streaming

HTTP

The default. Pick a method, set the URL, optionally add headers / body / auth. Hit Send.

Body modes:

• none — no body
• raw — text with content-type chooser (JSON, XML, plain, custom)
• form-data — multipart/form-data, supports text and file fields
• x-www-form-urlencoded — URL-encoded key/value pairs
• binary — file upload as the entire body, content-type from extension

Auth modes: Basic, Bearer, API Key (header / query / cookie), Digest, NTLM, Hawk, AWS Signature v4, OAuth 1.0, OAuth 2.0 (full flow), Inherit auth from parent collection.

Full reference →

SOAP

Two starting points:

• From WSDL — paste a URL or pick a file. Testnizer parses services, ports, and operations, then generates an example envelope per operation
• Manual — write the envelope by hand. Useful for debugging or for services without a WSDL

WS-Security is built in (UsernameToken, Timestamp, XML Signature, XML Encryption). WS-Security guide →

WebSocket

Connect to ws:// or wss:// with custom headers. Messages appear in a timeline (sent + received with timestamps). Compose messages as JSON or text.

Full reference →

GraphQL

Query, mutation, and subscription support. Testnizer detects whether your endpoint speaks HTTP-only or supports graphql-ws (subscription transport) and routes accordingly.

Schema introspection runs on demand and populates a searchable type browser on the right of the request editor.

Full reference →

gRPC

Pick a .proto file. Testnizer enumerates services and methods, generates JSON skeletons for request messages, and lets you fill them in.

Streaming modes:

• Unary — single request, single response
• Server-streaming — single request, response stream
• Client-streaming — request stream, single response
• Bidirectional — both streaming

Metadata (request and response) is editable. TLS / mTLS uses your project’s certificate store.

Full reference →

Server-Sent Events

Hit Send on an SSE endpoint and Testnizer holds the connection open, parsing events as they arrive. The Last-Event-ID header is set automatically on reconnect, so the server can resume from where it left off.

AI Chat

Pick a provider (OpenAI, Anthropic, Google, xAI, DeepSeek, Mistral, Groq, Perplexity, Cerebras, Cohere, Fireworks, DeepInfra, Together, OpenRouter) or choose Custom URL for self-hosted vLLM / LM Studio / Ollama / TGI.

Conversations are multi-turn with a system prompt. Responses stream by default. Variables ({{apiKey}}) resolve in URL, headers, and body — useful for keeping API keys in a project environment rather than the request itself.