{"id":196231,"date":"2026-09-28T14:59:25","date_gmt":"2026-09-28T05:59:25","guid":{"rendered":"https:\/\/support.questetra.com\/?p=196231"},"modified":"2026-09-29T16:16:40","modified_gmt":"2026-09-29T07:16:40","slug":"message-start-event-http-preupload","status":"publish","type":"post","link":"https:\/\/support.questetra.com\/en\/developer-blog\/message-start-event-http-preupload\/","title":{"rendered":"Starting a Case from Outside of Questetra BPM Suite (Pre-upload Chapter)"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"58\" data-attachment-id=\"113212\" data-permalink=\"https:\/\/support.questetra.com\/en\/developer-blog\/message-start-event-http-browser\/attachment\/professional-banner-new-en\/\" data-orig-file=\"https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2018\/12\/professional-banner-new-en.png?fit=1200%2C68&amp;ssl=1\" data-orig-size=\"1200,68\" data-comments-opened=\"0\" data-image-title=\"professional-banner-new-en\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2018\/12\/professional-banner-new-en.png?fit=1024%2C58&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2018\/12\/professional-banner-new-en-1024x58.png?resize=1024%2C58&#038;ssl=1\" alt=\"\" class=\"wp-image-113212\" srcset=\"https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2018\/12\/professional-banner-new-en.png?resize=1024%2C58&amp;ssl=1 1024w, https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2018\/12\/professional-banner-new-en.png?resize=600%2C34&amp;ssl=1 600w, https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2018\/12\/professional-banner-new-en.png?resize=768%2C44&amp;ssl=1 768w, https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2018\/12\/professional-banner-new-en.png?w=1200&amp;ssl=1 1200w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<ul style=\"line-height:1\" class=\"wp-block-list\">\n<li><a href=\"https:\/\/support.questetra.com\/en\/developer-blog\/message-start-event-http-browser\/\">Preparatory Chapter<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/support.questetra.com\/en\/developer-blog\/message-start-event-http-curl\/\">curl Chapter<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/support.questetra.com\/en\/developer-blog\/message-start-event-http-python\/\">Python Chapter<\/a><\/li>\n\n\n\n<li>Pre-upload Chapter<\/li>\n\n\n\n<li><a href=\"https:\/\/support.questetra.com\/en\/developer-blog\/message-start-event-http-error\/\">Error-handling Chapter<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/support.questetra.com\/en\/developer-blog\/debug-http-start\/\">Debug Chapter<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/support.questetra.com\/en\/developer-blog\/http-case-start-sequential\/\">Continuous Execution Notes<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/support.questetra.com\/en\/developer-blog\/case-starter-wp-form\/\">WordPress Form Chapter<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/support.questetra.com\/en\/developer-blog\/message-start-event-http-gas\/\">Google Apps Script Chapter<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Starting a Case After Pre-uploading Files<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In the curl and Python Chapters, we sent the file body along with other parameters in <code>multipart\/form-data<\/code> format to pass values to File-type Data Items. However, [Message Start Event (HTTP)] provides another method: &#8220;Pre-uploading&#8221;, where you upload the files first, receive file IDs, and then send those IDs in the request to start a case. In this post, we will explain this process using curl and Python.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pre-uploading is available for [Message Start Event (HTTP)]. It cannot be used with [Receive Task (HTTP)].<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pre-uploading becomes necessary when the total size of the attached files is large. A <code>multipart\/form-data<\/code> request received by [Message Start Event (HTTP)] has a maximum total limit of 100 MB, including all files and parameters. While sending the file body together with other parameters cannot exceed this limit, pre-uploading allows you to upload files separately, enabling you to attach files that total more than 100 MB.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We will use the same Workflow App as in the curl Chapter. If you haven&#8217;t created it yet, please refer to &#8220;Sending a variety of data > App Settings&#8221; in the Preparatory Chapter and curl Chapter to set up and release the app.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Procedure Overview<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pre-uploading involves sending two HTTP requests.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Upload the File<\/strong>: Send the API key and file to <code>\/File\/upload<\/code> in <code>multipart\/form-data<\/code> format. An ID for each file will be returned in the response.<\/li>\n\n\n\n<li><strong>Start the Case<\/strong>: Send the IDs received in Step 1 as values for the File-type parameters to <code>\/start<\/code>, along with the other parameters.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Request<\/th><th>URL<\/th><th>Content-Type<\/th><\/tr><\/thead><tbody><tr><td>File Upload<\/td><td><code>https:\/\/example.questetra.net\/System\/Event\/MessageStart\/{processModelInfoId}\/{nodeNumber}\/File\/upload<\/code><\/td><td>multipart\/form-data<\/td><\/tr><tr><td>Case Start<\/td><td><code>https:\/\/example.questetra.net\/System\/Event\/MessageStart\/{processModelInfoId}\/{nodeNumber}\/start<\/code><\/td><td>application\/x-www-form-urlencoded<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The <code>{processModelInfoId}<\/code> and <code>{nodeNumber}<\/code> values are the same as those used in the Case Start URL.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Starting a Case with curl<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Upload the File<\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>curl https:\/\/example.questetra.net\/System\/Event\/MessageStart\/{processModelInfoId}\/{nodeNumber}\/File\/upload ^\n  -F &quot;key={API Key}&quot; ^\n  -F &quot;files=@ques-kun-01.png&quot; ^\n  -F &quot;files=@ques-kun-02.png&quot;<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The parameter name for passing files is fixed as <code>files<\/code>, rather than using the field name of the Data Item. When uploading multiple files, repeat <code>files<\/code> for each one. Pass the API key using the same <code>key<\/code> parameter as when starting a case.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Upon a successful upload, JSON structured like the following will be returned:<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-json\" data-lang=\"JSON\"><code>{\n  &quot;files&quot;: [\n    {\n      &quot;id&quot;: &quot;12345:AbCdEfGhIjKlMnOp&quot;,\n      &quot;name&quot;: &quot;ques-kun-01.png&quot;,\n      &quot;contentType&quot;: &quot;image\/png&quot;,\n&gt;      &quot;length&quot;: 34567,\n      &quot;lengthText&quot;: &quot;33.8 KB&quot;,\n      &quot;image&quot;: true,\n      &quot;inline&quot;: false,\n      &quot;malwareScanStatus&quot;: &quot;NO_THREATS_FOUND&quot;\n&gt;    },\n    {\n      &quot;id&quot;: &quot;12346:QrStUvWxYzAbCdEf&quot;,\n      &quot;name&quot;: &quot;ques-kun-02.png&quot;,\n      &quot;contentType&quot;: &quot;image\/png&quot;,\n      &quot;length&quot;: 45678,\n      &quot;lengthText&quot;: &quot;44.7 KB&quot;,\n      &quot;image&quot;: true,\n      &quot;inline&quot;: false,\n      &quot;malwareScanStatus&quot;: &quot;NO_THREATS_FOUND&quot;\n    }\n  ]\n}\n<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">What you will use to start the case is the value of <code>files[].id<\/code>. Since it is a string formatted as the file number joined with an access token by a colon, pass it directly as-is to the next request.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Start the Case<\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>curl https:\/\/example.questetra.net\/System\/Event\/MessageStart\/{processModelInfoId}\/{nodeNumber}\/start ^\n  --data-urlencode &quot;key={API Key}&quot; ^\n  --data-urlencode &quot;title=Test&quot; ^\n  --data-urlencode &quot;q_str=This is a case start test&quot; ^\n  --data-urlencode &quot;q_file=12345:AbCdEfGhIjKlMnOp&quot; ^\n  --data-urlencode &quot;q_file=12346:QrStUvWxYzAbCdEf&quot;\n<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Pass the ID received during the upload step to the File-type parameter <code>q_file<\/code>. When attaching multiple files, repeat the parameter name just as you did when sending the actual file body in the curl Chapter. Because you are not sending the actual file payload here, you can transmit the request using the <code>--data-urlencode<\/code> option instead of the <code>-F<\/code> option required when sending File-type Data Items in the curl Chapter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Please send the request to start a case in <code>application\/x-www-form-urlencoded<\/code> format. If sent in <code>multipart\/form-data<\/code> format, the IDs will not be accepted, and the case will start without the files attached.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Starting a Case with Python<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">As in the Python Chapter, we will use the <code>requests<\/code> package. Extract the IDs from the upload response and add them to the case start parameters.<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\" data-lang=\"Python\"><code>import requests\n\n# API Endpoint\nbase_url = &#39;https:\/\/example.questetra.net\/System\/Event\/MessageStart\/{processModelInfoId}\/{nodeNumber}&#39;\napi_key = &#39;{API Key}&#39;\n\n# 1. Upload the files\nfiles = [ # Parameter name is fixed as &#39;files&#39;\n    (&#39;files&#39;, (&#39;ques-kun-01.png&#39;, open(&#39;.\/ques-kun-01.png&#39;, &#39;rb&#39;), &#39;image\/png&#39;)),\n    (&#39;files&#39;, (&#39;ques-kun-02.png&#39;, open(&#39;.\/ques-kun-02.png&#39;, &#39;rb&#39;), &#39;image\/png&#39;)),\n]\nr = requests.post(f&#39;{base_url}\/File\/upload&#39;, data={&#39;key&#39;: api_key}, files=files)\nr.raise_for_status()\nfile_ids = [f[&#39;id&#39;] for f in r.json()[&#39;files&#39;]] # List of IDs\n\n# 2. Start the case\nparams = [ # Use a list of tuples instead of a dict to repeat parameter names\n    (&#39;key&#39;, api_key),\n    (&#39;title&#39;, &#39;Test&#39;),\n    (&#39;q_str&#39;, &#39;This is a case start test&#39;),\n]\nparams += [(&#39;q_file&#39;, file_id) for file_id in file_ids]\nr = requests.post(f&#39;{base_url}\/start&#39;, data=params) # Sent as application\/x-www-form-urlencoded since &#39;files&#39; is omitted\nr.raise_for_status()\nprint(f&#39;Status Code: {r.status_code}&#39;)\nprint(r.text)<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">As explained in the Python Chapter, <code>requests<\/code> sends data formatted as <code>application\/x-www-form-urlencoded<\/code> as long as you do not pass <code>files<\/code>. Omit <code>files<\/code> in the request to start a case, and include the IDs within <code>data<\/code> instead.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Important Notes on Pre-uploading<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>The maximum limit for a single upload is 100 MB.<\/strong> This is the same limit as the request to start a case. If the total size exceeds this, upload the files across multiple requests.<\/li>\n\n\n\n<li><strong>The ID is valid for 1 hour.<\/strong> Please use the ID to start a case within 1 hour of uploading.<\/li>\n\n\n\n<li><strong>The ID can only be used once.<\/strong> An ID used to start a case becomes invalid afterward. If you want to attach the same file to a different case, please upload it again. If starting a case fails due to an input error, the ID has not been consumed yet, so you can retry starting the case using the same ID.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">By using pre-uploading, you can send files in advance and build your case start request using only string parameters. Make use of this method when you need to attach files that exceed the single-request limit. In the next post, &#8220;Troubleshooting Errors Chapter,&#8221; we will introduce how to view and handle errors when a case fails to start.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Related Documentation<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>R2210: Field Name Parameters and Value Formats for Data Items<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Here are the steps for the pre-upload procedure: First, upload the file to receive an ID, and then send that ID to the [Message Start Event (HTTP)].<\/p>\n","protected":false},"author":28,"featured_media":196423,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_uag_custom_page_level_css":"","advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"{title}\n\n{excerpt}\n\n{url}","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_wpas_customize_per_network":false,"jetpack_post_was_ever_published":false},"categories":[296],"tags":[],"faq_section":[],"class_list":["post-196231","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-developer-blog"],"jetpack_publicize_connections":[],"uagb_featured_image_src":{"full":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?fit=2816%2C1536&ssl=1",2816,1536,false],"thumbnail":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?resize=440%2C440&ssl=1",440,440,true],"medium":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?fit=578%2C315&ssl=1",578,315,true],"medium_large":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?fit=768%2C419&ssl=1",768,419,true],"large":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?fit=1024%2C559&ssl=1",1024,559,true],"1536x1536":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?fit=1536%2C838&ssl=1",1536,838,true],"2048x2048":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?fit=2048%2C1117&ssl=1",2048,1117,true],"newspack-article-block-landscape-large":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?resize=1200%2C900&ssl=1",1200,900,true],"newspack-article-block-portrait-large":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?resize=900%2C1200&ssl=1",900,1200,true],"newspack-article-block-square-large":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?resize=1200%2C1200&ssl=1",1200,1200,true],"newspack-article-block-landscape-medium":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?resize=800%2C600&ssl=1",800,600,true],"newspack-article-block-portrait-medium":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?resize=600%2C800&ssl=1",600,800,true],"newspack-article-block-square-medium":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?resize=800%2C800&ssl=1",800,800,true],"newspack-article-block-landscape-intermediate":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?resize=600%2C450&ssl=1",600,450,true],"newspack-article-block-portrait-intermediate":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?resize=450%2C600&ssl=1",450,600,true],"newspack-article-block-square-intermediate":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?resize=600%2C600&ssl=1",600,600,true],"newspack-article-block-landscape-small":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?resize=400%2C300&ssl=1",400,300,true],"newspack-article-block-portrait-small":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?resize=300%2C400&ssl=1",300,400,true],"newspack-article-block-square-small":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?resize=400%2C400&ssl=1",400,400,true],"newspack-article-block-landscape-tiny":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?resize=200%2C150&ssl=1",200,150,true],"newspack-article-block-portrait-tiny":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?resize=150%2C200&ssl=1",150,200,true],"newspack-article-block-square-tiny":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?resize=200%2C200&ssl=1",200,200,true],"newspack-article-block-uncropped":["https:\/\/i0.wp.com\/support.questetra.com\/wp-content\/uploads\/2026\/09\/external-start-en-fi.jpg?fit=1200%2C655&ssl=1",1200,655,true]},"uagb_author_info":{"display_name":"kobayashi","author_link":"https:\/\/support.questetra.com\/en\/author\/kobayashi\/"},"uagb_comment_info":0,"uagb_excerpt":"Here are the steps for the pre-upload procedure: First, upload the file to receive an ID, and then send that ID to the [Message Start Event (HTTP)].","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p9DiIh-P31","jetpack-related-posts":[{"id":147621,"url":"https:\/\/support.questetra.com\/en\/developer-blog\/debug-http-start\/","url_meta":{"origin":196231,"position":0},"title":"Starting a Case from Outside of Questetra BPM Suite (Debug Chapter)","author":"Hirotaka NISHI","date":"2023-06-21","format":false,"excerpt":"How to debug an App that starts triggered by receiving an HTTP request","rel":"","context":"In &quot;Questetra Developers Blog&quot;","block_context":{"text":"Questetra Developers 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