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Requirements:
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A solution for enforcement a size limit for invoice documents should be developed.
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But! From the RMB code:
// IMPORTANT!!!
// the body of the request will be read into memory for ALL PUT requests
// and for POST requests with the content-types below ONLY!!!
// multipart, for example will not be read by the body handler as vertx saves
// multiparts and www-encoded to disk - hence multiparts will be handled differently
// see uploadHandler further down
This means that we can't solve OOM issue if file size is larger that module heap size.
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Application/octet-stream mechanism allows to control sending request size in the following manner. For this approach we need to know approximate size of json request content size, metadata and Base64-encoded file size (original invoice document size (file size) + 30%). For example, file limit is 10 Mb, other json content size is 1 Mb. As a result MAX_DOCUMENT_SIZE limit parameter should be approx. 14Mb. This looks not so precise but should be enough for request size control.
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