Why not just open the WSDL in my IDE?

Because you're on a call and need the operation name, its message-exchange pattern, and the SOAP action in ten seconds. This gives you the shape of the service without a project import.

What does 'one-way' or 'request-response' mean here?

It's the message-exchange pattern, interpreted from the operation's input/output declarations — one-way means fire-and-forget with no response message defined.

viewers · free tool

WSDL Viewer

See a WSDL's operations, messages, and types without opening an IDE.

Runs in your browser — your data never leaves it

Input

Paste, type, or drop a file. Runs as you type.

Output

Output appears here as you type.

Worked example

Input

<definitions xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" name="Svc" targetNamespace="urn:t"><portType name="Svc"><operation name="Op"><input message="M"/></operation></portType></definitions>

Output

Svc — WSDL
────────────────────────────────────────────────────
Namespace  urn:t
Structure  1 operation · 0 messages · 0 types · 0 fields

OPERATIONS
  Op   [one-way]
      in   M

This example is one of WSDL Viewer's test cases — if the tool stopped producing this output, the build would fail.

Questions

Why not just open the WSDL in my IDE?: Because you're on a call and need the operation name, its message-exchange pattern, and the SOAP action in ten seconds. This gives you the shape of the service without a project import.
What does 'one-way' or 'request-response' mean here?: It's the message-exchange pattern, interpreted from the operation's input/output declarations — one-way means fire-and-forget with no response message defined.

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