Kong/insomnia · error

No header specified

Error message

No header specified

What it means

Error "No header specified" thrown in Kong/insomnia.

Source

Thrown at packages/insomnia/src/common/templating/local-template-tags.ts:953

          if (request.parameters.length === 0) {
            throw new Error('No query parameters available');
          }

          for (const queryParameter of request.parameters) {
            const queryParameterName = await context.util.render(queryParameter.name);
            queryParameterName && parameterNames.push(queryParameterName);
            if (queryParameterName?.toLowerCase() === name.toLowerCase()) {
              return context.util.render(queryParameter.value);
            }
          }

          const parameterNamesStr = parameterNames.map(n => `"${n}"`).join(',\n\t');
          throw new Error(`No query parameter with name "${name}".\nChoices are [\n\t${parameterNamesStr}\n]`);
        }
        if (attribute === 'header') {
          if (!name) {
            throw new Error('No header specified');
          }

          const headerNames: string[] = [];

          if (request.headers.length === 0) {
            throw new Error('No headers available');
          }

          for (const header of request.headers) {
            const headerName = await context.util.render(header.name);
            headerName && headerNames.push(headerName);
            if (headerName?.toLowerCase() === name.toLowerCase()) {
              return context.util.render(header.value);
            }
          }

          const headerNamesStr = headerNames.map(n => `"${n}"`).join(',\n\t');
          throw new Error(`No header with name "${name}".\nChoices are [\n\t${headerNamesStr}\n]`);

View on GitHub (pinned to d9bb2b0142)

When it happens

Trigger: Thrown at packages/insomnia/src/common/templating/local-template-tags.ts:953 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Kong/insomnia@d9bb2b0142 (2026-08-26). Data as JSON: /api/errors/7d17c60ead5fbd6a. Report an issue: GitHub.