"Invalid Link" Error in the API: Verifying the URL Before Creating an Order

What the "Invalid Link" Error in the API Means

The "Invalid Link" error means the API could not accept the URL in the order target field. This is not always a typo in the address. The service may reject a link due to an unsuitable format, page type, redirect, access restrictions, encoding, or a mismatch between the platform and the service.

Validation usually happens before the order is created. The API receives the URL, determines the domain and path, and tries to identify the object: a channel, video, stream, post, or profile. If any of these stages fails, the order will not be created. The generic error text alone does not show the cause — you need to look at the URL, the service parameters, and the full API response.

Match the Error Text with the API Response

Different APIs have different wording and response structures. Sometimes the service returns only a message, sometimes it adds a code, a field name, or a request identifier. The full response is more useful than the HTTP status: even when the request is delivered successfully, the API may reject the order itself at the business validation level.

For example, a typical response might look like this: {"error":"invalid_link","message":"Invalid target URL","field":"link"}. Here you should check the value of the link field specifically. The variant {"error":"target_not_supported"} more often indicates not a broken address but an unsupported object type. Field names and codes depend on the specific documentation.

Save the response status, response body, service ID, and request_id if the API returns one. Do not include the access token, cookies, request signatures, or private link parameters in the ticket.

Check the URL Format and the Value of the Request Field

A link that works in a browser may fail machine validation. Sometimes the field contains only a video ID, a nickname without a domain, text from a message, or a shortened address. The error also occurs when the URL is passed not as a string but as a nested object or an array.

• Pass the full public URL including the https:// protocol.
• Check the domain: it must belong to the platform of the selected service.
• Remove leading and trailing spaces, line breaks, emojis, and text after the link.
• Verify the field name against the API documentation: link, url, target, or another.
• Make sure the request passes a string value, not an object with a URL inside.

Manually pasting the address is convenient, but it has a drawback: an invisible character or a fragment of the post caption can easily end up in the string. Clean the value before sending, but do not change the path and parameters themselves unless necessary.

Expand Short Links and Remove Extra Redirects

Shortened addresses and links from the "Share" button often go through one or more redirects. The browser opens them automatically, but the promotion service's API may not follow redirects, may block them, or may receive an intermediate authorization page.

For an order, it is better to use the canonical address: the one visible in the address bar after the desired page has fully loaded. Campaign tags and view-time parameters do not always interfere, but parameters can lead to a different view of the page or affect object recognition.

The canonical URL has a drawback: sometimes it has to be obtained separately, especially after copying a link from a mobile app. On the other hand, such an address is easier to verify manually and match against the service rules.

Choose a Link to an Object the Service Accepts

A service may accept only one target type. An order for a channel will not accept a link to a stream recording, and a service for video views will not accept an author's profile. Both URLs look correct on the surface, but the API matches the address structure against the service's purpose and rejects an unsuitable object.

Check the service reference: the platform, category, allowed target_type, and restrictions. If the API requires a separate target type parameter, it must match the URL. Do not replace the content address with a link to search, a hashtag, a collection, the home page, or the author's dashboard.

• To promote a channel, pass the channel page.
• For views, use the link to a specific video or post.
• For an active stream, pass the stream URL if the service supports the live format.
• For reactions and other actions on a post, use the direct link to the post.

Check Privacy, Age Filters, and Login Requirements

The API checks not only the URL's form but also the target's availability. Content may open for the channel owner because their browser is authorized, but be unavailable to an external checking server. In this case, the service often returns a generic invalid link error.

• Check whether the profile, channel, post, or the stream itself is private.
• Make sure the video has not been deleted, moved to drafts, or replaced by another post.
• Check the age restriction: it may require age confirmation or account login.
• Disable subscriber-only, members-only, or approved-viewers access mode if it is enabled.
• Make sure the page does not show a login form, a content warning, or a technical placeholder.

Open the link in a private window without authorization. If a login prompt appears instead of the target page, change the access settings or choose a service that allows this target type, if one is available. The drawback of checking in a private window is that it does not always reveal regional and network restrictions.

Account for Regional, Mobile, and Embedded Addresses

A single object may have a desktop, mobile, localized, and embedded URL. An address from an app or webview sometimes contains technical segments that the API does not recognize. A localized page may also open differently for the checking server.

Open the copied link in a regular browser and wait for it to fully load. For the request, use the public web address from the address bar. If the content is region-restricted, remove the restriction if the platform settings allow it, or do not send such a target to a service that requires public access.

A public web link without authorization and intermediate screens is the most reliable option for API validation.

Rule Out URL Corruption When Sending the Request

A link may be correct before sending but change during JSON serialization, query parameter assembly, form-data submission, or re-encoding. The characters &, ?, #, and % are especially sensitive. For example, an ampersand in the URL can become a separator for the request's own parameters if the address is passed without the necessary encoding.

• Compare the original URL with the value in the actual HTTP request.
• Check the request body in client logs, a proxy, or developer tools.
• For JSON, use standard serialization rather than manually building the string.
• Do not encode the URL twice if the library does it automatically.
• Check how Cyrillic characters are handled in the path and address parameters.

Logs help you quickly find the discrepancy, but they have a drawback: API keys, tokens, and personal data may end up in them. Mask sensitive values before writing and transmitting logs.

Verify the Platform, Service ID, and Order Parameters

Some APIs check the service first, then the domain and link type. A URL from another platform, an outdated service_id, or an incorrect target_type can lead to the same "Invalid Link" error. In this case, changing the address itself is useless until the order parameters are fixed.

Update the service catalog via the API method if one is provided. A cache with an old list may hold a disabled service or its previous requirements. Frequent catalog updates have a drawback: they increase the number of requests and may hit the rate limit. Use a cache with a limited lifetime and refresh it after validation errors.

Check the Link Step by Step Before Resending

1. Copy the full URL without text, spaces, or hidden characters.
2. Open it in a private window without logging into an account.
3. Check that the page is not private, deleted, or requiring login.
4. Make sure there is no age, subscription, or regional restriction.
5. Expand the short link to the final public address.
6. Match the object in the URL with the service: channel, video, stream, or post.
7. Verify the platform, service_id, and target_type against the current service catalog.
8. Check the actual HTTP request body and URL encoding.
9. Save the full API response and request ID without tokens or private data.

If the error persists after these checks, provide support with the link in cleaned form, the service ID, the request time, the HTTP status, and the full API response text. This will help distinguish a URL problem from a specific service restriction or a validation failure on the service side.