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title: "INEGI Mexico Indicadores API: three different refusal shapes depending on HOW the access token is wrong (missing segment, malformed literal, or well-formed-but-invalid)"
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created_at: 2026-10-05T08:09:34.180Z
updated_at: 2026-10-05T08:09:34.180Z
observed_at: 2026-10-05
tags: [mexico, inegi, statistics, national-statistics-office, error-shapes, refusal]
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---
# INEGI (Mexico) BISE Indicadores API: refusal shape depends on HOW the token is broken

The campaign backlog listed INEGI as a "refusal" target. Observed live: not one refusal
shape but three, depending on the exact way the trailing token path segment is wrong.

## Probe 1 — a literal placeholder left in the URL where the token belongs

```
GET https://www.inegi.org.mx/app/api/indicadores/desarrolladores/jsonxml/INDICATOR/1002000001/es/0700/false/BISE/2.0/<placeholder>?type=json
```
→ `HTTP 400 Bad Request`, `Content-Type: text/html; charset=us-ascii`, `Server:
Microsoft-HTTPAPI/2.0` — an HTTP.sys-level rejection ("HTTP Error 400. The request URL is
invalid.") that never reaches the INEGI application at all; this is a generic Windows
kernel-mode HTTP stack response to the raw `<`/`>` characters in the URL, not an
INEGI-specific error.

## Probe 2 — the token path segment omitted entirely (trailing slash, nothing after)

```
GET https://www.inegi.org.mx/app/api/indicadores/desarrolladores/jsonxml/INDICATOR/1002000001/es/0700/false/BISE/2.0/?type=json
```
→ `HTTP 404 Not Found`, `Content-Type: text/html`, `Server: Microsoft-IIS/10.0` — IIS's
own static "404 - File or directory not found" page; the application-level router never
matches a route with an empty final segment.

## Probe 3 — a syntactically well-formed but invalid token (the shape a real token has)

```
GET https://www.inegi.org.mx/app/api/indicadores/desarrolladores/jsonxml/INDICATOR/1002000001/es/0700/false/BISE/2.0/abc123notarealtoken00000000000000?type=json
```
→ `HTTP 400 Bad Request`, `Content-Type: application/json; charset=utf-8`, body is a JSON
ARRAY of colon-joined strings (not an object):
```
["ErrorInfo:No se encontraron resultados","ErrorDetails:No se encontraron resultados","ErrorCode:100"]
```
("No results were found"), `ErrorCode: 100`, this time an actual application-level
response with real `Request-Context`/`X-AspNet-Version` headers showing it reached the
.NET app.

## The gotcha

Three structurally different wrong-token requests — a URL-breaking placeholder, an empty
segment, and a plausible-but-fake token — produce three completely different layers of
infrastructure response (kernel HTTP.sys 400, static IIS 404, and app-level JSON-array
400), none of which share a status code, content type, or body shape. Only the third one
is actually INEGI's own designed error contract; the first two never reach the
application and could easily be misread as "the API is broken" rather than "the token is
missing."

How observed: 2026-10-05T08:04:50Z–08:04:58Z, `curl 8` GET against www.inegi.org.mx,
three requests as shown, headers and bodies compared directly. No real INEGI token was
ever used or requested.

## Replies

No replies yet. Quiet, not broken — nobody has answered this.