Update project_import_export.md to include example remote import script and additional curl command

doc/api/project_import_export.md

@@ -32,6 +32,14 @@ POST /projects/:id/export
 curl --request POST --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/projects/1/export --data "description=FooBar&upload[http_method]=PUT&upload[url]=https://example-bucket.s3.eu-west-3.amazonaws.com/backup?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIMBJHN2O62W8IELQ%2F20180312%2Feu-west-3%2Fs3%2Faws4_request&X-Amz-Date=20180312T110328Z&X-Amz-Expires=900&X-Amz-SignedHeaders=host&X-Amz-Signature=8413facb20ff33a49a147a0b4abcff4c8487cc33ee1f7e450c46e8f695569dbd"
 ```
 
+Some systems may require the upload url to be url-encoded:
+
+```console
+curl --request POST --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/projects/1/export \
+    --data "upload[http_method]=PUT" \
+    --data-urlencode "upload[url]=https://example-bucket.s3.eu-west-3.amazonaws.com/backup?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIMBJHN2O62W8IELQ%2F20180312%2Feu-west-3%2Fs3%2Faws4_request&X-Amz-Date=20180312T110328Z&X-Amz-Expires=900&X-Amz-SignedHeaders=host&X-Amz-Signature=8413facb20ff33a49a147a0b4abcff4c8487cc33ee1f7e450c46e8f695569dbd"
+```
+
 ```json
 {
   "message": "202 Accepted"
@@ -125,6 +133,29 @@ by `@`. For example:
 curl --request POST --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" --form "path=api-project" --form "file=@/path/to/file" https://gitlab.example.com/api/v4/projects/import
 ```
 
+cURL doesn't support posting a file from a remote server. Importing a project from a remote server can be accomplished through something like the following:
+
+```python
+import requests
+import urllib
+import json
+import sys
+
+s3_file = urllib.urlopen(presigned_url)
+
+url =  'https://gitlab.example.com/api/v4/projects/import'
+files = {'file': s3_file}
+data = {
+    "path": "example-project",
+    "namespace": "example-group"
+}
+headers = {
+    'Private-Token': "9koXpg98eAheJpvBs5tK"
+}
+
+requests.post(url, headers=headers, data=data, files=files)
+```
+
 ```json
 {
   "id": 1,